171 terms

Statistical studies in which researchers control variables of interest are

experimental studies

The collection of all elements of interest in a particular study is

population

The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of

descriptive statistics

When the data are labels or names used to identify an attribute of the elements, the variable has which scale of measurement?

nominal

The weight of a ball bearing, measured in milligrams, is an example of

quantitative data

In a recent study based upon an inspection of 200 homes in Daisy City, 120 were found to violate one or more city codes.

Refer to Exhibit 1-1. The city manager released a statement that 60% of Daisy City's 3,000 homes are in violation of city codes. The manager's statement is an example of

Refer to Exhibit 1-1. The city manager released a statement that 60% of Daisy City's 3,000 homes are in violation of city codes. The manager's statement is an example of

statistical inference

Categorical data

may be either numeric or nonnumeric

In a sample of 800 students in a university, 360, or 45%, live in the dormitories. The 45% is an example of

descriptive statistics

Since a sample is a subset of the population, the sample mean

can be larger, smaller, or equal to the mean of the population

Which of the following is NOT an example of a firm that sells or leases business database services to clients?

U. S. Census Bureau

The set of measurements collected for a particular element is (are) called

observations

In a data set, the number of observations will always be the same as the number of

elements

Ordinary arithmetic operations are meaningful

only with quantitative data

The process of analyzing sample data in order to draw conclusions about the characteristics of a population is called

statistical inference

Six hundred residents of a city are polled to obtain information on voting intentions in an upcoming city election. The six hundred residents in this study is an example of a(n)

Selected Answer:

Selected Answer:

sample

Quantitative data

are always numeric

Income is an example of

quantitative data

__________ is a spreadsheet package.

Microsoft Excel

All the data collected in a particular study are referred to as the

data set

In the textbook, a worksheet that displays the Excel formulas used to create the results shown in the value worksheet is a

formula worksheet

Categorical data

are labels used to identify attributes of elements

In a post office, the mailboxes are numbered from 1 to 5,000. These numbers represent

categorical data

The summaries of data, which may be tabular, graphical, or numerical, are referred to as

descriptive statistics

When the data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure, the variable has which scale of measurement?

interval

Data collected over several time periods are

time sensitive data

Temperature is an example of

. a quantitative variable

When the data are labels or names used to identify an attribute of the elements and the rank of the data is meaningful, the variable has which scale of measurement?

ordinal

A Scanner Data User Survey of 50 companies found that the average amount spent on scanner data per category of consumer goods was $387,325 (Mercer Management Consulting, Inc., April 24, 1997). The $387,325 is an example of

Both quantitative data and a descriptive statistic are correct.

__________ is an example of an existing source of data.

U. S. Census Bureau

Arithmetic operations are inappropriate for

categorical data

In the textbook, a worksheet that displays the data for the problem and shows the results of the analysis is a

value worksheet

In a sample of 800 students in a university, 160, or 20%, are Business majors. Based on the above information, the school's paper reported that "20% of all the students at the university are Business majors." This report is an example of

statistical inference

The entities on which data are collected are

elements

A sample of five Fortune 500 companies showed the following industry codes: banking, banking, finance, retail, and banking. Based on this information, which of the following statements is correct?

Sixty percent of the sample of five companies are banking industries.

Since a sample is a subset of the population, a percentage that is calculated from the sample data

can be larger, smaller, or equal to the corresponding percentage from the population

The birth weight of newborns, measured in grams, is an example of

quantitative data

In a recent study based upon an inspection of 200 homes in Daisy City, 120 were found to violate one or more city codes.

Refer to Exhibit 1-1. The Daisy City study described above is an example of the use of a

Refer to Exhibit 1-1. The Daisy City study described above is an example of the use of a

sample

In a recent study based upon an inspection of 200 homes in Daisy City, 120 were found to violate one or more city codes.

Refer to Exhibit 1-1. The manager's statement that 60% of Daisy City's 3,000 homes are in violation of city codes is

Refer to Exhibit 1-1. The manager's statement that 60% of Daisy City's 3,000 homes are in violation of city codes is

only an approximation, since it is based upon sample information

Which scale of measurement can be either numeric or nonnumeric?

nominal and ordinal

Statistical inference

is the process of drawing inferences about the population based on the information taken from the sample

The number of sick days taken (per month) by 200 factory workers is summarized below.

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The cumulative frequency for the class of 11 - 15

Selected Answer:

Correct4. is 199

Answers:

1. is 200

2. is 1

3. is 14

Correct4. is 199

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The cumulative frequency for the class of 11 - 15

Selected Answer:

Correct4. is 199

Answers:

1. is 200

2. is 1

3. is 14

Correct4. is 199

199

A survey of 400 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school.

Undergraduate Major

Graduate School

Business

Engineering

Others

Total

Yes

35

42

63

140

No

91

104

65

260

Total

126

146

128

400

Refer to Exhibit 2-4. What percentage of the students does not plan to go to graduate school?

Selected Answer:

Correct1. 65

Answers:

Correct1. 65

2. 520

3. 32

4. 280

Undergraduate Major

Graduate School

Business

Engineering

Others

Total

Yes

35

42

63

140

No

91

104

65

260

Total

126

146

128

400

Refer to Exhibit 2-4. What percentage of the students does not plan to go to graduate school?

Selected Answer:

Correct1. 65

Answers:

Correct1. 65

2. 520

3. 32

4. 280

65

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The class width for this distribution

Selected Answer:

Incorrect2. is 9

Answers:

1. varies from class to class

2. is 9

3. is 39, which is: the largest value minus the smallest value or 39 - 0 = 39

Correct4. is 10

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The class width for this distribution

Selected Answer:

Incorrect2. is 9

Answers:

1. varies from class to class

2. is 9

3. is 39, which is: the largest value minus the smallest value or 39 - 0 = 39

Correct4. is 10

10

A tabular summary of a set of data showing the fraction of the total number of items in several nonoverlapping classes is a

Selected Answer:

Incorrect3. frequency distribution.

Answers:

Correct1. relative frequency distribution.

2. cumulative frequency distribution.

3. frequency distribution.

4. frequency.

Selected Answer:

Incorrect3. frequency distribution.

Answers:

Correct1. relative frequency distribution.

2. cumulative frequency distribution.

3. frequency distribution.

4. frequency.

relative frequency distribution

Before drawing any conclusions about the relationship between two variables shown in a crosstabulation, you should

Selected Answer:

Incorrect4. construct a scatter diagram and find the trendline

Answers:

Correct1. investigate whether any hidden variables could affect the conclusions

2. construct an ogive for each of the variables

3. develop a relative frequency distribution

4. construct a scatter diagram and find the trendline

Selected Answer:

Incorrect4. construct a scatter diagram and find the trendline

Answers:

Correct1. investigate whether any hidden variables could affect the conclusions

2. construct an ogive for each of the variables

3. develop a relative frequency distribution

4. construct a scatter diagram and find the trendline

investigate whether any hidden variables could affect the conclusions

Exhibit 2-3The number of sick days taken (per month) by 200 factory workers is summarized below.

Number of Days

Frequency

1 − 5

120

6 − 10

65

11 − 15

14

16 − 20

1

Refer to Exhibit 2-3. The class width for this distribution

Selected Answer:

Correct3. is 5

Answers:

1. is 20, which is: the largest value minus the smallest value or 20 − 0 = 20

2. varies from class to class

Correct3. is 5

4. is 6

Number of Days

Frequency

1 − 5

120

6 − 10

65

11 − 15

14

16 − 20

1

Refer to Exhibit 2-3. The class width for this distribution

Selected Answer:

Correct3. is 5

Answers:

1. is 20, which is: the largest value minus the smallest value or 20 − 0 = 20

2. varies from class to class

Correct3. is 5

4. is 6

5

Data that provide labels or names for groupings of like items are known as

Selected Answer:

Correct3. categorical data

Answers:

1. generic data

2. label data

Correct3. categorical data

4. quantitative data

Selected Answer:

Correct3. categorical data

Answers:

1. generic data

2. label data

Correct3. categorical data

4. quantitative data

categorical data

Qualitative data can be graphically represented by using a(n)

Selected Answer:

Incorrect3. histogram

Answers:

Correct1. bar graph

2. frequency polygon

3. histogram

4. ogive

Selected Answer:

Incorrect3. histogram

Answers:

Correct1. bar graph

2. frequency polygon

3. histogram

4. ogive

bar graph

Exhibit 2-3

The number of sick days taken (per month) by 200 factory workers is summarized below.

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The number of workers who took at least 11 sick days per month

Selected Answer:

Incorrect2. was 200

Answers:

Correct1. was 15

2. was 200

3. was 65

4. was 185

The number of sick days taken (per month) by 200 factory workers is summarized below.

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The number of workers who took at least 11 sick days per month

Selected Answer:

Incorrect2. was 200

Answers:

Correct1. was 15

2. was 200

3. was 65

4. was 185

15

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The midpoint of the last class is

Selected Answer:

Correct1. 34.5

Answers:

Correct1. 34.5

2. 50

3. 35

4. 34

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The midpoint of the last class is

Selected Answer:

Correct1. 34.5

Answers:

Correct1. 34.5

2. 50

3. 35

4. 34

34.5

The total number of data items with a value less than or equal to the upper limit for the class is given by the

Selected Answer:

Correct1. cumulative frequency distribution

Answers:

Correct1. cumulative frequency distribution

2. frequency distribution

3. relative frequency distribution

4. cumulative relative frequency distribution

Selected Answer:

Correct1. cumulative frequency distribution

Answers:

Correct1. cumulative frequency distribution

2. frequency distribution

3. relative frequency distribution

4. cumulative relative frequency distribution

cumulative frequency distribution

When using Excel to create a __________ one must edit the chart to remove the gaps between rectangles.

Selected Answer:

Correct1. histogram

Answers:

Correct1. histogram

2. bar graph

3. pie chart

4. scatter diagram

Selected Answer:

Correct1. histogram

Answers:

Correct1. histogram

2. bar graph

3. pie chart

4. scatter diagram

histogram

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The percentage of students working 19 hours or less is

Selected Answer:

Correct4. 25%

Answers:

1. 20%

2. 80%

3. 75%

Correct4. 25%

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The percentage of students working 19 hours or less is

Selected Answer:

Correct4. 25%

Answers:

1. 20%

2. 80%

3. 75%

Correct4. 25%

4.25%

A graphical presentation of the relationship between two quantitative variables is

Selected Answer:

Incorrect2. a crosstabulation

Answers:

1. a histogram

2. a crosstabulation

Correct3. a scatter diagram

4. a pie chart

Selected Answer:

Incorrect2. a crosstabulation

Answers:

1. a histogram

2. a crosstabulation

Correct3. a scatter diagram

4. a pie chart

a scatter diagram

Fifteen percent of the students in a School of Business Administration are majoring in Economics, 20% in Finance, 35% in Management, and 30% in Accounting. The graphical device(s) that can be used to present these data is (are)

Selected Answer:

Correct2. both a bar graph and a pie chart

Answers:

1. only a bar graph

Correct2. both a bar graph and a pie chart

3. only a pie chart

4. a line graph

Selected Answer:

Correct2. both a bar graph and a pie chart

Answers:

1. only a bar graph

Correct2. both a bar graph and a pie chart

3. only a pie chart

4. a line graph

...

In constructing a frequency distribution, as the number of classes are decreased, the class width

Selected Answer:

Incorrect3. remains unchanged

Answers:

Correct1. increases

2. can increase or decrease depending on the data values

3. remains unchanged

4. decreases

Selected Answer:

Incorrect3. remains unchanged

Answers:

Correct1. increases

2. can increase or decrease depending on the data values

3. remains unchanged

4. decreases

increases

When the conclusions based upon the aggregated crosstabulation can be completely reversed if we look at the unaggregated data, the occurrence is known as

Selected Answer:

Correct3. Simpson's paradox

Answers:

1. disaggregation

2. reverse correlation

Correct3. Simpson's paradox

4. inferential statistics

Selected Answer:

Correct3. Simpson's paradox

Answers:

1. disaggregation

2. reverse correlation

Correct3. Simpson's paradox

4. inferential statistics

Simpsons paradox

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The percentage of students who work at least 10 hours per week is

Selected Answer:

Incorrect1. 5%

Answers:

1. 5%

Correct2. 95%

3. 50%

4. 100%

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The percentage of students who work at least 10 hours per week is

Selected Answer:

Incorrect1. 5%

Answers:

1. 5%

Correct2. 95%

3. 50%

4. 100%

95%

A survey of 400 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school.

Undergraduate Major

Graduate School

Business

Engineering

Others

Total

Yes

35

42

63

140

No

91

104

65

260

Total

126

146

128

400

Refer to Exhibit 2-4. Among the students who plan to go to graduate school, what percentage indicated "Other" majors?

Selected Answer:

Correct2. 45

Answers:

1. 54

Correct2. 45

3. 15.75

4. 35

Undergraduate Major

Graduate School

Business

Engineering

Others

Total

Yes

35

42

63

140

No

91

104

65

260

Total

126

146

128

400

Refer to Exhibit 2-4. Among the students who plan to go to graduate school, what percentage indicated "Other" majors?

Selected Answer:

Correct2. 45

Answers:

1. 54

Correct2. 45

3. 15.75

4. 35

...

The difference between the lower class limits of adjacent classes provides the

Selected Answer:

Incorrect2. class limits

Answers:

1. number of classes

2. class limits

3. class midpoint

Correct4. class width

Selected Answer:

Incorrect2. class limits

Answers:

1. number of classes

2. class limits

3. class midpoint

Correct4. class width

...

The number of sick days taken (per month) by 200 factory workers is summarized below.

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The relative frequency of workers who took 10 or fewer sick days

Selected Answer:

Correct4. was 0.925

Answers:

1. was 15

2. was 185

3. was 93

Correct4. was 0.925

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The relative frequency of workers who took 10 or fewer sick days

Selected Answer:

Correct4. was 0.925

Answers:

1. was 15

2. was 185

3. was 93

Correct4. was 0.925

0.925

The ages of employees at a company represent

Selected Answer:

Incorrect4. categorical data

Answers:

1. label data

2. time series data

Correct3. quantitative data

4. categorical data

Selected Answer:

Incorrect4. categorical data

Answers:

1. label data

2. time series data

Correct3. quantitative data

4. categorical data

...

Exhibit 2-1

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The relative frequency of students working 9 hours or less

Selected Answer:

Correct2. 0.05

Answers:

1. is 20

Correct2. 0.05

3. is 100

4. is 0.95

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The relative frequency of students working 9 hours or less

Selected Answer:

Correct2. 0.05

Answers:

1. is 20

Correct2. 0.05

3. is 100

4. is 0.95

...

In a cumulative percent frequency distribution, the last class will have a cumulative percent frequency equal to

Selected Answer:

Incorrect2. the total number of elements in the data set

Answers:

1. one

2. the total number of elements in the data set

Correct3. 100

4. None of the other answers are correct.

Selected Answer:

Incorrect2. the total number of elements in the data set

Answers:

1. one

2. the total number of elements in the data set

Correct3. 100

4. None of the other answers are correct.

100

Excel's __________ can be used to construct a frequency distribution for quantitative data.

Selected Answer:

Incorrect4. COUNTIF function

Answers:

1. SUM function

2. AVERAGE function

Correct3. PivotTable Report

4. COUNTIF function

Selected Answer:

Incorrect4. COUNTIF function

Answers:

1. SUM function

2. AVERAGE function

Correct3. PivotTable Report

4. COUNTIF function

pivot table report

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the above data, the last class will have a cumulative frequency of

Selected Answer:

Correct1. 400

Answers:

Correct1. 400

2. 30 - 39

3. 1

4. 100

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the above data, the last class will have a cumulative frequency of

Selected Answer:

Correct1. 400

Answers:

Correct1. 400

2. 30 - 39

3. 1

4. 100

400

A tabular summary of data showing the percentage of items in each of several nonoverlapping classes is a

Selected Answer:

Correct2. percent frequency distribution

Answers:

1. frequency distribution

Correct2. percent frequency distribution

3. cumulative percent frequency distribution

4. relative frequency distribution

Selected Answer:

Correct2. percent frequency distribution

Answers:

1. frequency distribution

Correct2. percent frequency distribution

3. cumulative percent frequency distribution

4. relative frequency distribution

...

Information on the type of industry is provided for a sample of 50 Fortune 500 companies.

Industry Type

Frequency

Banking

7

Consumer Products

15

Electronics

10

Retail

18

Refer to Exhibit 2-2. The number of industries that are classified as retail is

Selected Answer:

Correct1. 18

Answers:

Correct1. 18

2. 36%

3. 32

4. 0.36

Industry Type

Frequency

Banking

7

Consumer Products

15

Electronics

10

Retail

18

Refer to Exhibit 2-2. The number of industries that are classified as retail is

Selected Answer:

Correct1. 18

Answers:

Correct1. 18

2. 36%

3. 32

4. 0.36

18

A tabular method that can be used to summarize the data on two variables simultaneously is called

Selected Answer:

Correct4. a crosstabulation

Answers:

1. simultaneous equations

2. a dot plot

3. a histogram

Correct4. a crosstabulation

Selected Answer:

Correct4. a crosstabulation

Answers:

1. simultaneous equations

2. a dot plot

3. a histogram

Correct4. a crosstabulation

crosstabulation

A(n) __________ is a graph of a cumulative distribution.

Selected Answer:

Incorrect3. stem-and-leaf display

Answers:

1. pie chart

Correct2. ogive

3. stem-and-leaf display

4. histogram

Selected Answer:

Incorrect3. stem-and-leaf display

Answers:

1. pie chart

Correct2. ogive

3. stem-and-leaf display

4. histogram

ogive

A graphical device for depicting qualitative data that have been summarized in a frequency distribution, relative frequency distribution, or percent frequency distribution is a(n)

Selected Answer:

Correct2. bar graph

Answers:

1. histogram

Correct2. bar graph

3. ogive

4. stem-and-leaf display

Selected Answer:

Correct2. bar graph

Answers:

1. histogram

Correct2. bar graph

3. ogive

4. stem-and-leaf display

bar graph

Excel's Chart Tools can be used to construct a

Selected Answer:

Correct1. All of these can be constructed using Excel's Chart Tools.

Answers:

Correct1. All of these can be constructed using Excel's Chart Tools.

2. bar graph

3. pie chart

4. histogram

Selected Answer:

Correct1. All of these can be constructed using Excel's Chart Tools.

Answers:

Correct1. All of these can be constructed using Excel's Chart Tools.

2. bar graph

3. pie chart

4. histogram

all of the above

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 29

Selected Answer:

Correct1. is 0.75

Answers:

Correct1. is 0.75

2. is 0.25

3. is 0.5

4. is 300

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 29

Selected Answer:

Correct1. is 0.75

Answers:

Correct1. is 0.75

2. is 0.25

3. is 0.5

4. is 300

0.75

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The cumulative frequency for the class of 20 - 29

Selected Answer:

Correct4. is 300

Answers:

1. is 0.75

2. is 0.50

3. is 200

Correct4. is 300

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The cumulative frequency for the class of 20 - 29

Selected Answer:

Correct4. is 300

Answers:

1. is 0.75

2. is 0.50

3. is 200

Correct4. is 300

300

The number of sick days taken (per month) by 200 factory workers is summarized below.

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The number of workers who took less than 11 sick days per month

Selected Answer:

Correct3. was 185

Answers:

1. was 15

2. was 65

Correct3. was 185

4. was 200

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The number of workers who took less than 11 sick days per month

Selected Answer:

Correct3. was 185

Answers:

1. was 15

2. was 65

Correct3. was 185

4. was 200

185

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The number of students working 19 hours or less

Selected Answer:

Correct3. is 100

Answers:

1. is 80

2. is 300

Correct3. is 100

4. is 180

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The number of students working 19 hours or less

Selected Answer:

Correct3. is 100

Answers:

1. is 80

2. is 300

Correct3. is 100

4. is 180

100

The number of sick days taken (per month) by 200 factory workers is summarized below.

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The cumulative percent frequency for the class of 16 - 20 is

Selected Answer:

Correct4. 100%

Answers:

1. 65%

2. 92.5%

3. 0.5%

Correct4. 100%

Number of Days

Frequency

0 - 5

120

6 - 10

65

11 - 15

14

16 - 20

1

Refer to Exhibit 2-3. The cumulative percent frequency for the class of 16 - 20 is

Selected Answer:

Correct4. 100%

Answers:

1. 65%

2. 92.5%

3. 0.5%

Correct4. 100%

100%

A frequency distribution is

Selected Answer:

Correct1. a tabular summary of a set of data showing the number of items in each of several nonoverlapping classes

Answers:

Correct1. a tabular summary of a set of data showing the number of items in each of several nonoverlapping classes

2. a tabular summary of a set of data showing the fraction of items in each of several nonoverlapping classes

3. a graphical form of representing data

4. a graphical device for presenting categorical data

Selected Answer:

Correct1. a tabular summary of a set of data showing the number of items in each of several nonoverlapping classes

Answers:

Correct1. a tabular summary of a set of data showing the number of items in each of several nonoverlapping classes

2. a tabular summary of a set of data showing the fraction of items in each of several nonoverlapping classes

3. a graphical form of representing data

4. a graphical device for presenting categorical data

a tabular summary of a set of data showing the number of items in each of several non overlapping classes

Excel's __________ can be used to construct a crosstabulation.

Selected Answer:

Correct1. PivotTable Report

Answers:

Correct1. PivotTable Report

2. COUNTIF function

3. SUM function

4. Chart Tools

Selected Answer:

Correct1. PivotTable Report

Answers:

Correct1. PivotTable Report

2. COUNTIF function

3. SUM function

4. Chart Tools

pivot table report

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 - 39 is

Selected Answer:

Correct4. 100%

Answers:

1. 25%

2. 50%

3. 75%

Correct4. 100%

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 - 39 is

Selected Answer:

Correct4. 100%

Answers:

1. 25%

2. 50%

3. 75%

Correct4. 100%

100%

The first quartile

Selected Answer:

Correct2. is the same as the 25th percentile

Answers:

1. is the same as the 50th percentile

Correct2. is the same as the 25th percentile

3. is the same as the 75th percentile

4. contains at least one third of the data elements

Question 2

Selected Answer:

Correct2. is the same as the 25th percentile

Answers:

1. is the same as the 50th percentile

Correct2. is the same as the 25th percentile

3. is the same as the 75th percentile

4. contains at least one third of the data elements

Question 2

25th percentile

The mean of a sample is

Selected Answer:

Correct4. computed by summing all the data values and dividing the sum by the number of items

Answers:

1. always smaller than the mean of the population

2. computed by summing the data values and dividing the sum by (n - 1)

3. always equal to the mean of the population

Correct4. computed by summing all the data values and dividing the sum by the number of items

Question 3

Selected Answer:

Correct4. computed by summing all the data values and dividing the sum by the number of items

Answers:

1. always smaller than the mean of the population

2. computed by summing the data values and dividing the sum by (n - 1)

3. always equal to the mean of the population

Correct4. computed by summing all the data values and dividing the sum by the number of items

Question 3

...

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

Selected Answer:

Correct1. only when individual data values are unavailable

Answers:

Correct1. only when individual data values are unavailable

2. whenever computer packages for descriptive statistics are unavailable

3. only when the data are from a population

4. as much as possible since computations are easier

Selected Answer:

Correct1. only when individual data values are unavailable

Answers:

Correct1. only when individual data values are unavailable

2. whenever computer packages for descriptive statistics are unavailable

3. only when the data are from a population

4. as much as possible since computations are easier

...

In a five-number summary, which of the following is not used for data summarization?

Selected Answer:

Correct2. the mean

Answers:

1. the median

Correct2. the mean

3. the smallest value

4. the largest value

Selected Answer:

Correct2. the mean

Answers:

1. the median

Correct2. the mean

3. the smallest value

4. the largest value

...

A numerical measure computed from a sample, such as sample mean, is known as a

Selected Answer:

Correct1. sample statistic

Answers:

Correct1. sample statistic

2. population parameter

3. sample parameter

4. population mean

Selected Answer:

Correct1. sample statistic

Answers:

Correct1. sample statistic

2. population parameter

3. sample parameter

4. population mean

...

Excel's __________ function can be used to compute the population covariance.

Selected Answer:

Correct2. COVAR

Answers:

1. CORREL

Correct2. COVAR

3. VAR

4. MAX

Selected Answer:

Correct2. COVAR

Answers:

1. CORREL

Correct2. COVAR

3. VAR

4. MAX

...

Which of the following is not a measure of location?

Selected Answer:

Correct2. variance

Answers:

1. mean

Correct2. variance

3. mode

4. median

Selected Answer:

Correct2. variance

Answers:

1. mean

Correct2. variance

3. mode

4. median

...

Excel's __________ function can be used to compute the population variance.

Selected Answer:

Incorrect3. VAR

Answers:

1. MAX

2. MODE

3. VAR

Correct4. None of the other answers are correct.

Selected Answer:

Incorrect3. VAR

Answers:

1. MAX

2. MODE

3. VAR

Correct4. None of the other answers are correct.

...

Excel's __________ function can be used to compute the sample correlation coefficient.

Selected Answer:

Correct4. CORREL

Answers:

1. COVAR

2. MAX

3. VAR

Correct4. CORREL

Selected Answer:

Correct4. CORREL

Answers:

1. COVAR

2. MAX

3. VAR

Correct4. CORREL

...

The symbol σ 2 (Sigma Square) is used to represent the

Selected Answer:

Correct2. variance of the population

Answers:

1. None of the other answers are correct.

Correct2. variance of the population

3. standard deviation of the population

4. standard deviation of the samp

Selected Answer:

Correct2. variance of the population

Answers:

1. None of the other answers are correct.

Correct2. variance of the population

3. standard deviation of the population

4. standard deviation of the samp

...

Which of the following is not a measure of dispersion?

Selected Answer:

Correct4. the 50th percentile

Answers:

1. the interquartile range

2. the range

3. the standard deviation

Correct4. the 50th percentile

Selected Answer:

Correct4. the 50th percentile

Answers:

1. the interquartile range

2. the range

3. the standard deviation

Correct4. the 50th percentile

...

The numerical value of the standard deviation can never be

Selected Answer:

Incorrect1. all of these statements are correct

Answers:

1. all of these statements are correct

Correct2. negative

3. zero

4. larger than the variance

Selected Answer:

Incorrect1. all of these statements are correct

Answers:

1. all of these statements are correct

Correct2. negative

3. zero

4. larger than the variance

...

Since the population is always larger than the sample, the value of the sample mean

Selected Answer:

Correct1. could be larger, equal to, or smaller than the true value of the population mean

Answers:

Correct1. could be larger, equal to, or smaller than the true value of the population mean

2. is always smaller than the true value of the population mean

3. is always equal to the true value of the population mean

4. is always larger than the true value of the population mean

Selected Answer:

Correct1. could be larger, equal to, or smaller than the true value of the population mean

Answers:

Correct1. could be larger, equal to, or smaller than the true value of the population mean

2. is always smaller than the true value of the population mean

3. is always equal to the true value of the population mean

4. is always larger than the true value of the population mean

...

A researcher has collected the following sample data.

5 12 6 8 5

6 7 5 12 4

Refer to Exhibit 3-1. The mean is

Selected Answer:

Correct2. 7

Answers:

1. 5

Correct2. 7

3. 8

4. 6

5 12 6 8 5

6 7 5 12 4

Refer to Exhibit 3-1. The mean is

Selected Answer:

Correct2. 7

Answers:

1. 5

Correct2. 7

3. 8

4. 6

...

In computing the pth percentile, if the index i is an integer the pth percentile is the

Selected Answer:

Incorrect1. data value in position i

Answers:

1. data value in position i

2. data value in position i + 1

Correct3. average of data values in position i and i + 1

Question 20

Selected Answer:

Incorrect1. data value in position i

Answers:

1. data value in position i

2. data value in position i + 1

Correct3. average of data values in position i and i + 1

Question 20

...

The value of the sum of the squared deviations from the mean, i.e., mc035-1.jpg must always be

Selected Answer:

Correct4. at least zero

Answers:

1. less than the mean

2. negative

3. either positive or negative depending on whether the mean is negative or positive

Correct4. at least zero

Selected Answer:

Correct4. at least zero

Answers:

1. less than the mean

2. negative

3. either positive or negative depending on whether the mean is negative or positive

Correct4. at least zero

...

A researcher has collected the following sample data. The mean of the sample is 5.

3 5 12 3 2

Refer to Exhibit 3-2. The variance is

Selected Answer:

Correct3. 16.5

Answers:

1. 4.062

2. 13.2

Correct3. 16.5

4. 80

3 5 12 3 2

Refer to Exhibit 3-2. The variance is

Selected Answer:

Correct3. 16.5

Answers:

1. 4.062

2. 13.2

Correct3. 16.5

4. 80

...

The correlation coefficient ranges between

Selected Answer:

Correct4. -1 and +1

Answers:

1. minus infinity and plus infinity

2. 0 and 1

3. 1 and 100

Correct4. -1 and +1

Selected Answer:

Correct4. -1 and +1

Answers:

1. minus infinity and plus infinity

2. 0 and 1

3. 1 and 100

Correct4. -1 and +1

...

Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500.

Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $37,500 is

Selected Answer:

Correct3. 2

Answers:

1. -2

2. 0.92

Correct3. 2

4. 37.5

Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $37,500 is

Selected Answer:

Correct3. 2

Answers:

1. -2

2. 0.92

Correct3. 2

4. 37.5

...

The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.

Speed (MPH)

Frequency

50 - 54

2

55 - 59

4

60 - 64

5

65 - 69

10

70 - 74

9

75 - 79

5

35

Refer to Exhibit 3-4. The standard deviation is

Selected Answer:

Correct3. 7.071

Answers:

1. 6.969

2. 48.570

Correct3. 7.071

4. 50.000

Speed (MPH)

Frequency

50 - 54

2

55 - 59

4

60 - 64

5

65 - 69

10

70 - 74

9

75 - 79

5

35

Refer to Exhibit 3-4. The standard deviation is

Selected Answer:

Correct3. 7.071

Answers:

1. 6.969

2. 48.570

Correct3. 7.071

4. 50.000

...

A numerical measure of linear association between two variables is the

Selected Answer:

Correct1. covariance

Answers:

Correct1. covariance

2. standard deviation

3. variance

4. coefficient of variation

Selected Answer:

Correct1. covariance

Answers:

Correct1. covariance

2. standard deviation

3. variance

4. coefficient of variation

...

µ is an example of a

Selected Answer:

Correct3. population parameter

Answers:

1. population variance

2. mode

Correct3. population parameter

4. sample statistic

Selected Answer:

Correct3. population parameter

Answers:

1. population variance

2. mode

Correct3. population parameter

4. sample statistic

...

The population variance can never be

Selected Answer:

Incorrect4. zero

Answers:

1. all of these are correct

Correct2. negative

3. larger than the standard deviation

4. zero

Selected Answer:

Incorrect4. zero

Answers:

1. all of these are correct

Correct2. negative

3. larger than the standard deviation

4. zero

...

Excel's __________ function can be used to compute the population standard deviation.

Selected Answer:

Incorrect3. STDEV

Answers:

1. MODE

Correct2. None of the other answers are correct.

3. STDEV

4. MAX

Selected Answer:

Incorrect3. STDEV

Answers:

1. MODE

Correct2. None of the other answers are correct.

3. STDEV

4. MAX

...

The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

Selected Answer:

Correct1. 8

Answers:

Correct1. 8

2. 4096

3. 0

4. 6,561

Selected Answer:

Correct1. 8

Answers:

Correct1. 8

2. 4096

3. 0

4. 6,561

...

Since the median is the middle value of a data set, it must always be

Selected Answer:

Correct4. None of the other answers are correct.

Answers:

1. larger than the mode

2. smaller than the mean

3. smaller than the mode

Correct4. None of the other answers are correct.

Selected Answer:

Correct4. None of the other answers are correct.

Answers:

1. larger than the mode

2. smaller than the mean

3. smaller than the mode

Correct4. None of the other answers are correct.

...

Excel's __________ function can be used to compute the sample variance.

Selected Answer:

Correct3. VAR

Answers:

1. STDEV

2. MAX

Correct3. VAR

4. MODE

Selected Answer:

Correct3. VAR

Answers:

1. STDEV

2. MAX

Correct3. VAR

4. MODE

...

A graphical summary of data that is based on a five-number summary is a

Selected Answer:

Correct1. box plot

Answers:

Correct1. box plot

2. histogram

3. stem-and-leaf display

4. scatter diagram

Selected Answer:

Correct1. box plot

Answers:

Correct1. box plot

2. histogram

3. stem-and-leaf display

4. scatter diagram

...

The following is a frequency distribution of grades for a statistics examination.

Examination Grade

Frequency

40 − 49

2

50 − 59

4

60 − 69

10

70 − 79

25

80 − 89

14

90 − 99

5

Treating these data as a sample, compute the sample Standard Deviation [x1]

Use 4 decimals (0.0000) for your response.

Specified Answer for: x1

Incorrect10.6038

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 11.4980

CorrectExact Match 11.498

CorrectExact Match 11.49

CorrectExact Match 11.5

Question 38

Examination Grade

Frequency

40 − 49

2

50 − 59

4

60 − 69

10

70 − 79

25

80 − 89

14

90 − 99

5

Treating these data as a sample, compute the sample Standard Deviation [x1]

Use 4 decimals (0.0000) for your response.

Specified Answer for: x1

Incorrect10.6038

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 11.4980

CorrectExact Match 11.498

CorrectExact Match 11.49

CorrectExact Match 11.5

Question 38

...

The following is a frequency distribution of grades for a statistics examination.

Examination Grade

Frequency

40 − 49

2

50 − 59

4

60 − 69

10

70 − 79

25

80 − 89

14

90 − 99

5

Treating these data as a sample, compute the sample mean [x1]

Use 4 decimals (0.0000) for your response.

Specified Answer for: x1

Incorrect13.5663

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 74.5000

CorrectExact Match 74.5

CorrectExact Match 74.50

CorrectExact Match 74.500

Examination Grade

Frequency

40 − 49

2

50 − 59

4

60 − 69

10

70 − 79

25

80 − 89

14

90 − 99

5

Treating these data as a sample, compute the sample mean [x1]

Use 4 decimals (0.0000) for your response.

Specified Answer for: x1

Incorrect13.5663

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 74.5000

CorrectExact Match 74.5

CorrectExact Match 74.50

CorrectExact Match 74.500

...

The following is a frequency distribution of grades for a statistics examination.

Examination Grade

Frequency

40 − 49

2

50 − 59

4

60 − 69

10

70 − 79

25

80 − 89

14

90 − 99

5

Treating these data as a sample, compute the sample Variance [x1]

Use 4 decimals (0.0000) for your response.

Specified Answer for: x1

Incorrect238.5261

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 132.2034

CorrectExact Match 132.203

CorrectExact Match 132.20

CorrectExact Match 132.2

Examination Grade

Frequency

40 − 49

2

50 − 59

4

60 − 69

10

70 − 79

25

80 − 89

14

90 − 99

5

Treating these data as a sample, compute the sample Variance [x1]

Use 4 decimals (0.0000) for your response.

Specified Answer for: x1

Incorrect238.5261

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 132.2034

CorrectExact Match 132.203

CorrectExact Match 132.20

CorrectExact Match 132.2

...

The following is a frequency distribution of grades for a statistics examination.

Examination Grade

Frequency

40 − 49

2

50 − 59

4

60 − 69

10

70 − 79

25

80 − 89

14

90 − 99

5

Treating these data as a sample, compute the sample Coefficient of Variation [x1]%

Use 4 decimals (0.0000) for your response.

Specified Answer for: x1

Incorrect68.3981

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 15.4335

CorrectExact Match 15.434

CorrectExact Match 15.43

CorrectExact Match 15.4

Examination Grade

Frequency

40 − 49

2

50 − 59

4

60 − 69

10

70 − 79

25

80 − 89

14

90 − 99

5

Treating these data as a sample, compute the sample Coefficient of Variation [x1]%

Use 4 decimals (0.0000) for your response.

Specified Answer for: x1

Incorrect68.3981

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 15.4335

CorrectExact Match 15.434

CorrectExact Match 15.43

CorrectExact Match 15.4

...

A

B

C

D

E

1

Prior

Conditional

Joint

Posterior

2

Event

Probability

Probability

Probability

Probability

3

A1

0.45

0.22

0.099

4

A2

0.55

0.16

0.088

5

0.187

For the Excel worksheet above, which of the following formulas would correctly calculate the posterior probability for cell E3?

Selected Answer:

Correct1. =D3/$D$5

Answers:

Correct1. =D3/$D$5

2. =SUM(B3:D3)

3. B3/C3+D3

4. =D5/$D$3

B

C

D

E

1

Prior

Conditional

Joint

Posterior

2

Event

Probability

Probability

Probability

Probability

3

A1

0.45

0.22

0.099

4

A2

0.55

0.16

0.088

5

0.187

For the Excel worksheet above, which of the following formulas would correctly calculate the posterior probability for cell E3?

Selected Answer:

Correct1. =D3/$D$5

Answers:

Correct1. =D3/$D$5

2. =SUM(B3:D3)

3. B3/C3+D3

4. =D5/$D$3

...

A six-sided die is tossed 3 times. The probability of observing three ones in a row is

Selected Answer:

Correct1. 1/216

Answers:

Correct1. 1/216

2. 1/27

3. 1/6

4. 1/3

Selected Answer:

Correct1. 1/216

Answers:

Correct1. 1/216

2. 1/27

3. 1/6

4. 1/3

...

One of the basic requirements of probability is

Selected Answer:

Correct4. if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1

Answers:

1. for each experimental outcome Ei, we must have P(Ei) ≥ 1

2. both P(A) = P(Ac) - 1 and if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1

3. P(A) = P(Ac) - 1

Correct4. if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1

Selected Answer:

Correct4. if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1

Answers:

1. for each experimental outcome Ei, we must have P(Ei) ≥ 1

2. both P(A) = P(Ac) - 1 and if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1

3. P(A) = P(Ac) - 1

Correct4. if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1

...

Any process that generates well-defined outcomes is

Selected Answer:

Correct1. an experiment

Answers:

Correct1. an experiment

2. an event

3. a sample point

4. None of the other answers is correct.

Selected Answer:

Correct1. an experiment

Answers:

Correct1. an experiment

2. an event

3. a sample point

4. None of the other answers is correct.

...

A(n) __________ is a graphical representation in which the sample space is represented by a rectangle and events are represented as circles.

Selected Answer:

Correct2. Venn diagram

Answers:

1. tree diagram

Correct2. Venn diagram

3. histogram

4. frequency polygon

Selected Answer:

Correct2. Venn diagram

Answers:

1. tree diagram

Correct2. Venn diagram

3. histogram

4. frequency polygon

...

Three applications for admission to a local university are checked to determine whether each applicant is male or female. The number of sample points in this experiment is

Selected Answer:

Correct4. 8

Answers:

1. 4

2. 2

3. 6

Correct4. 8

Selected Answer:

Correct4. 8

Answers:

1. 4

2. 2

3. 6

Correct4. 8

...

A method of assigning probabilities that assumes the experimental outcomes are equally likely is referred to as the

Selected Answer:

Correct4. classical method

Answers:

1. experimental method

2. subjective method

3. objective method

Correct4. classical method

Selected Answer:

Correct4. classical method

Answers:

1. experimental method

2. subjective method

3. objective method

Correct4. classical method

...

If A and B are mutually exclusive events with P(A) = 0.3 and P(B) = 0.5, then P(A ∪ B) =

Selected Answer:

Correct2. 0.8

Answers:

1. 0.15

Correct2. 0.8

3. 0.2

4. 0.00

Selected Answer:

Correct2. 0.8

Answers:

1. 0.15

Correct2. 0.8

3. 0.2

4. 0.00

...

If P(A) = 0.62, P(B) = 0.47, and P(A ∪ B) = 0.88; then P(A ∩ B) =

Selected Answer:

Correct2. 0.2100

Answers:

1. 0.2914

Correct2. 0.2100

3. 1.9700

4. 0.6700

Selected Answer:

Correct2. 0.2100

Answers:

1. 0.2914

Correct2. 0.2100

3. 1.9700

4. 0.6700

...

Events A and B are mutually exclusive. Which of the following statements is also true?

Selected Answer:

Correct4. P(A U B) = P(A) + P(B)

Answers:

1. A and B are also independent.

2. P(A U B) = P(A)P(B)

3. P(A Interception B) = P(A) + P(B)

Correct4. P(A U B) = P(A) + P(B)

Selected Answer:

Correct4. P(A U B) = P(A) + P(B)

Answers:

1. A and B are also independent.

2. P(A U B) = P(A)P(B)

3. P(A Interception B) = P(A) + P(B)

Correct4. P(A U B) = P(A) + P(B)

...

If two events are independent, then

Selected Answer:

Correct3. None of the other answers is correct.

Answers:

1. the probability of their intersection must be zero

2. the sum of their probabilities must be equal to one

Correct3. None of the other answers is correct.

4. they must be mutually exclusive

Question 14

Selected Answer:

Correct3. None of the other answers is correct.

Answers:

1. the probability of their intersection must be zero

2. the sum of their probabilities must be equal to one

Correct3. None of the other answers is correct.

4. they must be mutually exclusive

Question 14

...

In statistical experiments, each time the experiment is repeated

Selected Answer:

Correct3. a different outcome may occur

Answers:

1. None of the other answers is correct.

2. the same outcome must occur

Correct3. a different outcome may occur

4. the same outcome can not occur again

Question 15

Selected Answer:

Correct3. a different outcome may occur

Answers:

1. None of the other answers is correct.

2. the same outcome must occur

Correct3. a different outcome may occur

4. the same outcome can not occur again

Question 15

...

Initial estimates of the probabilities of events are known as

Selected Answer:

Correct2. prior probabilities

Answers:

1. conditional probabilities

Correct2. prior probabilities

3. sets

4. posterior probabilities

Selected Answer:

Correct2. prior probabilities

Answers:

1. conditional probabilities

Correct2. prior probabilities

3. sets

4. posterior probabilities

...

A sample point refers to a(n)

Selected Answer:

Incorrect1. All of these answers are correct.

Answers:

1. All of these answers are correct.

2. numerical measure of the likelihood of the occurrence of an event

Correct3. individual outcome of an experiment

4. set of all possible experimental outcomes

Selected Answer:

Incorrect1. All of these answers are correct.

Answers:

1. All of these answers are correct.

2. numerical measure of the likelihood of the occurrence of an event

Correct3. individual outcome of an experiment

4. set of all possible experimental outcomes

...

Of the last 100 customers entering a computer shop, 25 have purchased a computer. If the classical method for computing probability is used, the probability that the next customer will purchase a computer is

Selected Answer:

Correct3. 0.50

Answers:

1. 0.25

2. 1.00

Correct3. 0.50

4. 0.75

Selected Answer:

Correct3. 0.50

Answers:

1. 0.25

2. 1.00

Correct3. 0.50

4. 0.75

...

An experiment consists of three steps. There are four possible results on the first step, three possible results on the second step, and two possible results on the third step. The total number of experimental outcomes is

Selected Answer:

Correct3. 24

Answers:

1. 14

2. 9

Correct3. 24

4. 36

Selected Answer:

Correct3. 24

Answers:

1. 14

2. 9

Correct3. 24

4. 36

...

If P(A) = 0.80, P(B) = 0.65, and P(A ∪ B) = 0.78, then P(B⎮A) =

Selected Answer:

Incorrect2. Not enough information is given to answer this question.

Answers:

1. 0.6700

2. Not enough information is given to answer this question.

Correct3. 0.8375

4. 0.9750

Selected Answer:

Incorrect2. Not enough information is given to answer this question.

Answers:

1. 0.6700

2. Not enough information is given to answer this question.

Correct3. 0.8375

4. 0.9750

...

When the assumption of equally likely outcomes is used to assign probability values, the method used to assign probabilities is referred to as the

Selected Answer:

Correct1. classical method

Answers:

Correct1. classical method

2. probability method

3. subjective method

4. relative frequency method

Selected Answer:

Correct1. classical method

Answers:

Correct1. classical method

2. probability method

3. subjective method

4. relative frequency method

...

Each customer entering a department store will either buy or not buy some merchandise. An experiment consists of following 3 customers and determining whether or not they purchase any merchandise. The number of sample points in this experiment is

Selected Answer:

Correct2. 8

Answers:

1. 6

Correct2. 8

3. 2

4. 4

Selected Answer:

Correct2. 8

Answers:

1. 6

Correct2. 8

3. 2

4. 4

...

The range of probability is

Selected Answer:

Correct2. zero to one

Answers:

1. any value between -1 to 1

Correct2. zero to one

3. any value between minus infinity to plus infinity

4. any value larger than zero

Selected Answer:

Correct2. zero to one

Answers:

1. any value between -1 to 1

Correct2. zero to one

3. any value between minus infinity to plus infinity

4. any value larger than zero

...

A lottery is conducted using three urns. Each urn contains chips numbered from 0 to 9. One chip is selected at random from each urn. The total number of sample points in the sample space is

Selected Answer:

Correct1. 1,000

Answers:

Correct1. 1,000

2. 30

3. 729

4. 100

Selected Answer:

Correct1. 1,000

Answers:

Correct1. 1,000

2. 30

3. 729

4. 100

...

The addition law is potentially helpful when we are interested in computing the probability of

Selected Answer:

Correct2. the union of two events

Answers:

1. the intersection of two events

Correct2. the union of two events

3. conditional events

4. independent events

Selected Answer:

Correct2. the union of two events

Answers:

1. the intersection of two events

Correct2. the union of two events

3. conditional events

4. independent events

...

When the results of experimentation or historical data are used to assign probability values, the method used to assign probabilities is referred to as the

Selected Answer:

Incorrect4. posterior method

Answers:

Correct1. relative frequency method

2. classical method

3. subjective method

4. posterior method

Selected Answer:

Incorrect4. posterior method

Answers:

Correct1. relative frequency method

2. classical method

3. subjective method

4. posterior method

...

The probability assigned to each experimental outcome must be

Selected Answer:

Correct1. between zero and one

Answers:

Correct1. between zero and one

2. one

3. any value larger than zero

4. smaller than zero

Selected Answer:

Correct1. between zero and one

Answers:

Correct1. between zero and one

2. one

3. any value larger than zero

4. smaller than zero

...

Since the sun must rise tomorrow, then the probability of the sun rising tomorrow is

Selected Answer:

Correct4. None of the other answers is correct.

Answers:

1. much larger than one

2. zero

3. infinity

Correct4. None of the other answers is correct.

Selected Answer:

Correct4. None of the other answers is correct.

Answers:

1. much larger than one

2. zero

3. infinity

Correct4. None of the other answers is correct.

...

Assume your favorite football team has 2 games left to finish the season. The outcome of each game can be win, lose or tie. The number of possible outcomes is

Selected Answer:

Correct1. None of the other answers is correct.

Answers:

Correct1. None of the other answers is correct.

2. 6

3. 2

4. 4

Selected Answer:

Correct1. None of the other answers is correct.

Answers:

Correct1. None of the other answers is correct.

2. 6

3. 2

4. 4

...

Each individual outcome of an experiment is called

Selected Answer:

Incorrect2. an experiment

Answers:

Correct1. a sample point

2. an experiment

3. the sample space

4. an individual

Selected Answer:

Incorrect2. an experiment

Answers:

Correct1. a sample point

2. an experiment

3. the sample space

4. an individual

...

If A and B are independent events with P(A) = 0.2 and P(B) = 0.6, then P(A ∪ B) =

Selected Answer:

Incorrect2. 0.12

Answers:

1. 0.62

2. 0.12

3. 0.60

Correct4. 0.68

Selected Answer:

Incorrect2. 0.12

Answers:

1. 0.62

2. 0.12

3. 0.60

Correct4. 0.68

...

The "Top Three" at a racetrack consists of picking the correct order of the first three horses in a race. If there are 10 horses in a particular race, how many "Top Three" outcomes are there?

Selected Answer:

Correct2. 720

Answers:

1. 1,814,400

Correct2. 720

3. 302,400

4. 10

Selected Answer:

Correct2. 720

Answers:

1. 1,814,400

Correct2. 720

3. 302,400

4. 10

...

The sample space refers to

Selected Answer:

Correct4. the set of all possible experimental outcomes

Answers:

1. any particular experimental outcome

2. the sample size minus one

3. both any particular experimental outcome and the set of all possible experimental outcomes are correct

Correct4. the set of all possible experimental outcomes

Selected Answer:

Correct4. the set of all possible experimental outcomes

Answers:

1. any particular experimental outcome

2. the sample size minus one

3. both any particular experimental outcome and the set of all possible experimental outcomes are correct

Correct4. the set of all possible experimental outcomes

...

If A and B are independent events with P(A) = 0.4 and P(B) = 0.6, then P(A ∩ B) =

Selected Answer:

Correct2. 0.24

Answers:

1. 0.2

Correct2. 0.24

3. 1.00

4. 0.76

Selected Answer:

Correct2. 0.24

Answers:

1. 0.2

Correct2. 0.24

3. 1.00

4. 0.76

...

If A and B are independent events with P(A) = 0.05 and P(B) = 0.65, then P(A⎮B) =

Selected Answer:

Incorrect4. 0.8

Answers:

1. 0.65

Correct2. 0.05

3. 0.0325

4. 0.8

Selected Answer:

Incorrect4. 0.8

Answers:

1. 0.65

Correct2. 0.05

3. 0.0325

4. 0.8

...

If two events are mutually exclusive, then the probability of their intersection

Selected Answer:

Correct2. will be equal to zero

Answers:

1. must be larger than zero, but less than one

Correct2. will be equal to zero

3. will be one

4. can have any value larger than zero

Selected Answer:

Correct2. will be equal to zero

Answers:

1. must be larger than zero, but less than one

Correct2. will be equal to zero

3. will be one

4. can have any value larger than zero

...

A graphical device used for enumerating sample points in a multiple-step experiment is a

Selected Answer:

Correct2. None of the other answers is correct.

Answers:

1. pie chart

Correct2. None of the other answers is correct.

3. histogram

4. bar chart

Selected Answer:

Correct2. None of the other answers is correct.

Answers:

1. pie chart

Correct2. None of the other answers is correct.

3. histogram

4. bar chart

...

A perfectly balanced coin is tossed 6 times and tails appears on all six tosses. Then, on the seventh trial

Selected Answer:

Correct1. None of the other answers is correct.

Answers:

Correct1. None of the other answers is correct.

2. heads has a larger chance of appearing than tails

3. tails has a better chance of appearing than heads

4. tails cannot appear

Selected Answer:

Correct1. None of the other answers is correct.

Answers:

Correct1. None of the other answers is correct.

2. heads has a larger chance of appearing than tails

3. tails has a better chance of appearing than heads

4. tails cannot appear

...

Which of the following statements is(are) always true?

Selected Answer:

Correct3. P(A) = 1 - P(Ac)

Answers:

1. -1 ≤ P(Ei) ≤ 1

2. both P(A) = 1 - P(Ac) and P(A) + P(B) = 1

Correct3. P(A) = 1 - P(Ac)

4. P(A) + P(B) = 1

Selected Answer:

Correct3. P(A) = 1 - P(Ac)

Answers:

1. -1 ≤ P(Ei) ≤ 1

2. both P(A) = 1 - P(Ac) and P(A) + P(B) = 1

Correct3. P(A) = 1 - P(Ac)

4. P(A) + P(B) = 1

...

Two events are mutually exclusive if

Selected Answer:

Correct1. they have no sample points in common

Answers:

Correct1. they have no sample points in common

2. the probability of their intersection is 1

3. the probability of their intersection is 0.5

4. the probability of their intersection is 1 and they have no sample points in common

Selected Answer:

Correct1. they have no sample points in common

Answers:

Correct1. they have no sample points in common

2. the probability of their intersection is 1

3. the probability of their intersection is 0.5

4. the probability of their intersection is 1 and they have no sample points in common

...

The "Top Four" at a racetrack consists of picking the correct order of the first four horses in a race. If there are 10 horses in a particular race, how many "Top Four" outcomes are there?

Selected Answer:

Incorrectb. 720

Answers:

Correcta. 5,040

b. 720

c. 1,814,400

d. 10

Answer Feedback: Incorrect.

Selected Answer:

Incorrectb. 720

Answers:

Correcta. 5,040

b. 720

c. 1,814,400

d. 10

Answer Feedback: Incorrect.

...

A six-sided die is tossed 2 times. The probability of observing two ones in a row is

Selected Answer:

Correctc. 1/36

Answers:

a. 1/3

b. 1/6

Correctc. 1/36

d. 1/216

Answer Feedback: Correct.

Selected Answer:

Correctc. 1/36

Answers:

a. 1/3

b. 1/6

Correctc. 1/36

d. 1/216

Answer Feedback: Correct.

...

Assume your favorite football team has 2 games left to finish the season. The outcome of each game can be win, lose or tie. The number of possible outcomes is

Selected Answer:

Correctd. None of the other answers are correct.

Answers:

a. 2

b. 4

c. 6

Correctd. None of the other answers are correct.

Answer Feedback: Correct.<br/><br/>

Selected Answer:

Correctd. None of the other answers are correct.

Answers:

a. 2

b. 4

c. 6

Correctd. None of the other answers are correct.

Answer Feedback: Correct.<br/><br/>

...

A(n) ____ is an unusually small or unusually large data value.

Selected Answer:

Correctd. outlier

Answers:

a. sample statistic

b. median

c. z-score

Correctd. outlier

Answer Feedback: Correct.<br/><br/>

Selected Answer:

Correctd. outlier

Answers:

a. sample statistic

b. median

c. z-score

Correctd. outlier

Answer Feedback: Correct.<br/><br/>

...

A characteristic of interest for the elements is called a(n)

Selected Answer:

Correctc. variable

Answers:

a. sample

b. data set

Correctc. variable

d. observation

Answer Feedback: Correct.

Selected Answer:

Correctc. variable

Answers:

a. sample

b. data set

Correctc. variable

d. observation

Answer Feedback: Correct.

...

When the data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure, the variable has which scale of measurement?

Selected Answer:

Correctc. interval

Answers:

a. nominal

b. ordinal

Correctc. interval

d. ratio

Answer Feedback: Correct.

Selected Answer:

Correctc. interval

Answers:

a. nominal

b. ordinal

Correctc. interval

d. ratio

Answer Feedback: Correct.

...

Which of the following variables use the interval scale of measurement?

Selected Answer:

Correctc. SAT scores

Answers:

a. name of stock exchange

b. time

Correctc. SAT scores

d. Social Security number

Answer Feedback: Correct.

Selected Answer:

Correctc. SAT scores

Answers:

a. name of stock exchange

b. time

Correctc. SAT scores

d. Social Security number

Answer Feedback: Correct.

...

The entities on which data are collected are

Selected Answer:

Correcta. elements

Answers:

Correcta. elements

b. populations

c. sets

d. samples

Answer Feedback: Correct.

Selected Answer:

Correcta. elements

Answers:

Correcta. elements

b. populations

c. sets

d. samples

Answer Feedback: Correct.

...

The variance of a sample of 64 observations equals 81. The standard deviation of the sample equals

Selected Answer:

Incorrectd. 6,561

Answers:

Correcta. 9

b. 4096

c. 8

d. 6,561

Answer Feedback: Incorrect.<br/><br/>

Selected Answer:

Incorrectd. 6,561

Answers:

Correcta. 9

b. 4096

c. 8

d. 6,561

Answer Feedback: Incorrect.<br/><br/>

...

Which of the following symbols represents the variance of the population?

Selected Answer:

Correcta.

Answers:

Correcta.

b.

c. µ

d.

Answer Feedback: Correct.

Selected Answer:

Correcta.

Answers:

Correcta.

b.

c. µ

d.

Answer Feedback: Correct.

...

Which of the following symbols represents the standard deviation of the population?

Selected Answer:

Correctb.

Answers:

a.

Correctb. o

c. µ

d.

Answer Feedback: Correct.

Selected Answer:

Correctb.

Answers:

a.

Correctb. o

c. µ

d.

Answer Feedback: Correct.

o

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated

mean = 160 range = 60

mode = 165 Std. Dev. = 32

median = 170

The coefficient of variation equals

Selected Answer:

Correctc. 20.00%

Answers:

a. 0.1125%

b. 11.25%

Correctc. 20.00%

d. 0.20%

Answer Feedback: Correct.

mean = 160 range = 60

mode = 165 Std. Dev. = 32

median = 170

The coefficient of variation equals

Selected Answer:

Correctc. 20.00%

Answers:

a. 0.1125%

b. 11.25%

Correctc. 20.00%

d. 0.20%

Answer Feedback: Correct.

...

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the above data, the last class will have a cumulative frequency of

Selected Answer:

Correctd. 400

Answers:

a. 100

b. 1

c. 30 - 39

Correctd. 400

Answer Feedback: Correct.<br/><br/>

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the above data, the last class will have a cumulative frequency of

Selected Answer:

Correctd. 400

Answers:

a. 100

b. 1

c. 30 - 39

Correctd. 400

Answer Feedback: Correct.<br/><br/>

...

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The number of students working 19 hours or less

Selected Answer:

Correctb. is 100

Answers:

a. is 80

Correctb. is 100

c. is 180

d. is 300

Answer Feedback: Correct.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The number of students working 19 hours or less

Selected Answer:

Correctb. is 100

Answers:

a. is 80

Correctb. is 100

c. is 180

d. is 300

Answer Feedback: Correct.

...

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 29

Selected Answer:

Incorrectd. is 0.5

Answers:

a. is 300

b. is 0.25

Correctc. is 0.75

d. is 0.5

Answer Feedback: Incorrect.<br/><br/>

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 29

Selected Answer:

Incorrectd. is 0.5

Answers:

a. is 300

b. is 0.25

Correctc. is 0.75

d. is 0.5

Answer Feedback: Incorrect.<br/><br/>

...

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The midpoint of the third class is

Selected Answer:

Correcta. none of the following

Answers:

Correcta. none of the following

b. 5.5

c. 13.5

d. 23.5

e. 33.5

Answer Feedback: Correct.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The midpoint of the third class is

Selected Answer:

Correcta. none of the following

Answers:

Correcta. none of the following

b. 5.5

c. 13.5

d. 23.5

e. 33.5

Answer Feedback: Correct.

...

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The percentage of students who work at least 20 hours per week is

Selected Answer:

Incorrecta. 25%

Answers:

a. 25%

b. 50%

Correctc. 75%

d. 100%

Answer Feedback: Incorrect.

Number of hours

Frequency

0 - 9

20

10 - 19

80

20 - 29

200

30 - 39

100

Refer to Exhibit 2-1. The percentage of students who work at least 20 hours per week is

Selected Answer:

Incorrecta. 25%

Answers:

a. 25%

b. 50%

Correctc. 75%

d. 100%

Answer Feedback: Incorrect.

...

Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500.

Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $32,500 is

Selected Answer:

Correcta. 0.0

Answers:

Correcta. 0.0

b. 2

c. 37.5

d. -2

Answer Feedback: Incorrect.<br/><br/>

Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $32,500 is

Selected Answer:

Correcta. 0.0

Answers:

Correcta. 0.0

b. 2

c. 37.5

d. -2

Answer Feedback: Incorrect.<br/><br/>

...

Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500.

Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $30,000 is

Selected Answer:

Correctb. -1

Answers:

a. 1.8

Correctb. -1

c. -0.78

d. -1.8

Answer Feedback: Incorrect.

Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $30,000 is

Selected Answer:

Correctb. -1

Answers:

a. 1.8

Correctb. -1

c. -0.78

d. -1.8

Answer Feedback: Incorrect.

...

The following observations are given for two variables.

y

x

5

2

8

12

18

3

20

6

22

11

30

19

10

18

7

9

Use four decimals for all calculations "0.0000"

A) Compute the sample covariance for the above data [x1].

B) Interpret the sample covariance for the above data [x2]

C) Compute the sample correlation coefficient [x3]

D) Interpret sample correlation coefficient [x4]

Specified Answer for: x1

Correct19.2857

Specified Answer for: x2

Incorrectpositive

Specified Answer for: x3

Correct.3453

Specified Answer for: x4

Incorrectnot a perfect positive but a positive

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 19.2857

CorrectExact Match 19.285

CorrectExact Match 19.286

CorrectExact Match 19.29

Correct Answers for: x2

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match Since the covariance is positive, it indicates a positive relationship between x and y.

Correct Answers for: x3

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 0.3453

CorrectExact Match .3453

CorrectExact Match .345

Correct Answers for: x4

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match There is a positive relationship between x and y. The relationship is not very strong.

y

x

5

2

8

12

18

3

20

6

22

11

30

19

10

18

7

9

Use four decimals for all calculations "0.0000"

A) Compute the sample covariance for the above data [x1].

B) Interpret the sample covariance for the above data [x2]

C) Compute the sample correlation coefficient [x3]

D) Interpret sample correlation coefficient [x4]

Specified Answer for: x1

Correct19.2857

Specified Answer for: x2

Incorrectpositive

Specified Answer for: x3

Correct.3453

Specified Answer for: x4

Incorrectnot a perfect positive but a positive

Correct Answers for: x1

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 19.2857

CorrectExact Match 19.285

CorrectExact Match 19.286

CorrectExact Match 19.29

Correct Answers for: x2

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match Since the covariance is positive, it indicates a positive relationship between x and y.

Correct Answers for: x3

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match 0.3453

CorrectExact Match .3453

CorrectExact Match .345

Correct Answers for: x4

Evaluation Method Correct Answer Case Sensitivity

CorrectExact Match There is a positive relationship between x and y. The relationship is not very strong.

...

A researcher has collected the following sample data. The mean of the sample is 3.

1

2

6

4

2

3

4

2

5

1

Refer to Exhibit 3-2. The coefficient of variation is

Selected Answers:

Correcta. 56.66%

Answers:

Correcta. 56.66%

b. 81.24%

c. 264%

d. 66.70%

Answer Feedback: Correct.

1

2

6

4

2

3

4

2

5

1

Refer to Exhibit 3-2. The coefficient of variation is

Selected Answers:

Correcta. 56.66%

Answers:

Correcta. 56.66%

b. 81.24%

c. 264%

d. 66.70%

Answer Feedback: Correct.

...

A researcher has collected the following sample data.

1

2

6

4

2

3

4

2

5

10

Refer to Exhibit 3-2. The range is

Selected Answer:

Correctd. 9

Answers:

a. 1

b. 2

c. 5

Correctd. 9

Answer Feedback: Correct.

1

2

6

4

2

3

4

2

5

10

Refer to Exhibit 3-2. The range is

Selected Answer:

Correctd. 9

Answers:

a. 1

b. 2

c. 5

Correctd. 9

Answer Feedback: Correct.

...