The main purpose of descriptive statistics is to

summarize data in a useful and informativie manner

The incomes of a group of 50 loan applications are obtained. Which level of measurement is income?

Ratio

When TV advertisements report "2 our of 3 dentists surveyed indicated they would recommend Brand X toothpaste to their patients" an informed consumer may question the conclusion because

the advertisement does not include the total number of dentists surveyed

A bank asks customers to evaluate the drive-thru service as good, average, or poor. Which level of measurement is this classification?

Ordinal

What is a portion or part of a population called?

sample

A marketing class of 50 students evaluated the instructor using the following scale: superior, good, average, poor, and inferior. The descriptive summary showed the following survey results: 2 % superior, 8% good, 45% average, 45 % poor, and 0% inferior.

Most students rated the instructor as poor or average

Which word is not part of the devinition of descriptive statistics? Organizing, Analyzing, Presenting, Predicting

Predicting

The reported unemployment is 5.5% of the population. What type of scale is used to measure unemployment?

Interval or ratio

What type of variable is the number of gallons of gasoline pumped by a filling station during a day?

Continuous

What type of variable is the number of robberies reported in your city

Discrete

Level of measurement:

The number of papers sold each Sunday during 2009

The number of papers sold each Sunday during 2009

ratio

level of measurement

The departments, such as editorial, advertising, sports, etc

The departments, such as editorial, advertising, sports, etc

nominal

level of measurement:

A summary of the number of papers sold by county

A summary of the number of papers sold by county

ratio

level of measurement:

The number of years employed by the newspaper for each employee

The number of years employed by the newspaper for each employee

ratio

sample or population:

the participants in a study of a new cholesterol drug?

the participants in a study of a new cholesterol drug?

sample

sample of population:

the drivers who received a speeding ticket in Kansas City last month

the drivers who received a speeding ticket in Kansas City last month

population

sample or population

Those on welfare in Cook County (chicago) Illinois

Those on welfare in Cook County (chicago) Illinois

population

sample or population

the 30 stocks reported as a part of the Dow Jones Industrial Average

the 30 stocks reported as a part of the Dow Jones Industrial Average

sample

In a marketing study, 100 consumers were asked to select the best digital music player from the iPod, the iRiver, and the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?

3

A set of data consists of 45 observations between $0 and $29.

a. how many classes would you recommend for the frequency distribution?

b. What class interval would you recommend? Round your answer to the nearest whole number?

a. how many classes would you recommend for the frequency distribution?

b. What class interval would you recommend? Round your answer to the nearest whole number?

a. 6 (use the 2 to the K rule 2^6)

b. 5 (29-0/6= 4.83 or 5

b. 5 (29-0/6= 4.83 or 5