171 terms

applied business statistics

STUDY
PLAY
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
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:
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
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
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
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
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
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.
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
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
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
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
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
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
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
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
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%
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
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
...
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
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
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%
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
...
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
...
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
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
...
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
...
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.
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
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
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
...
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
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
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
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
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
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
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
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
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
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%
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
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
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%
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
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
...
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
...
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
...
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
...
Excel's __________ function can be used to compute the population covariance.
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
...
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.
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
µ is an example of a
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
...
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
...
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
...
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.
...
Excel's __________ function can be used to compute the sample variance.
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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.
...
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
...
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
...
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
...
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
...
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
...
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)
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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.
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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.
...
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.
...
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/>
...
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/>
...
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.
...
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.
...
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.
...
The entities on which data are collected are
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/>
...
Which of the following symbols represents the variance of the population?
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.
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.
...
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/>
...
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.
...
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/>
...
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.
...
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.
...
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/>
...
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.
...
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.
...
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.
...
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.
...
YOU MIGHT ALSO LIKE...