Question 1

The number observations in a complete data set having 15 elements and 5 variables is

Accepted Answer

A)   5.
B)   10.
C)   15.
D)   75.E) A) and B)
F) B) and D) B

Question 2

Categorical data

Accepted Answer

A)   must be numeric.
B)   must be nonnumeric.
C)   cannot be numeric.
D)   may be either numeric or nonnumeric.E) B) and D)
F) B) and C)

Question 3

In a sample of 1,600 registered voters, 912 or 57% approve of the way the President is doing his job. The 57% approval is an example of

Accepted Answer

A)   a sample.
B)   descriptive statistics.
C)   statistical inference.
D)   a population.E) A) and C)
F) None of the above

Question 4

Data measured a nominal scale

Accepted Answer

A)   must be alphabetic.
B)   can be either numeric or nonnumeric.
C)   must be numeric.
D)   must rank order the data.E) A) and B)
F) A) and C) B

Question 5

Data collected over several time periods are _____ data.

Accepted Answer

A)   time series
B)   time controlled
C)   cross-sectional
D)   periodicE) None of the above
F) C) and D)

Question 6

The numbers on football jerseys are an example of _____ data.

Accepted Answer

A)   categorical
B)   either categorical or quantitative
C)   neither categorical or quantitative
D)   quantitativeE) B) and D)
F) B) and C)

Question 7

Goals scored in a soccer game is an example of

Accepted Answer

A)   a categorical variable.
B)   a quantitative variable.
C)   either a quantitative or categorical variable.
D)   neither a quantitative nor categorical variable.E) All of the above
F) None of the above B

Question 8

Statistical studies in which researchers control variables of interest are _____ studies.

Accepted Answer

A)   experimental
B)   random variable
C)   inferential
D)   observationalE) C) and D)
F) B) and D)

Question 9

In a questionnaire, respondents are asked to mark their marital status as single, married, divorced, or widowed. Marital status is an example of a(n)  _____ variable.

Accepted Answer

A)   categorical
B)   quantitative
C)   interval-scale
D)   ordinal-scaleE) B) and C)
F) B) and D)

Question 10

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

Accepted Answer

A)   is always smaller than
B)   is always larger than
C)   must be equal to
D)   varies aroundE) B) and D)
F) B) and C)

Question 11

Which of the following is a categorical variable?

Accepted Answer

A)   Your age when you began college
B)   Your Social Security Number
C)   Your statistics class start time
D)   Your birth yearE) None of the above
F) A) and B)

Question 12

The type of analytics whose models yield a best course of action to take is _____ analytics.

Accepted Answer

A)   descriptive
B)   prescriptive
C)   predictive
D)   inferentialE) All of the above
F) A) and D)

Question 13

The set of measurements collected for a particular element are called

Accepted Answer

A)   variables.
B)   observations.
C)   samples.
D)   populations.E) All of the above
F) A) and C)

Question 14

Dr. Kurt Thearling, a leading practitioner in the field, defines data mining as "the _____ extraction of _____ information from databases."

Accepted Answer

A)   thorough, insightful
B)   timely, accurate
C)   automated, predictive
D)   intentional, usefulE) A) and B)
F) All of the above

Question 15

In a random sample of 200 items, 5 items were defective. An estimate of the percentage of defective items in the population is

Accepted Answer

A)   5%.
B)   2.5%.
C)   20%.
D)   10%.E) A) and D)
F) A) and C)

Question 16

Arithmetic operations are inappropriate for

Accepted Answer

A)   categorical data.
B)   quantitative data.
C)   both categorical and quantitative data.
D)   large data sets.E) A) and B)
F) C) and D)

Question 17

The scale of measurement that is used to rank order the observation for a variable is called the _____ scale.

Accepted Answer

A)   ratio
B)   ordinal
C)   nominal
D)   intervalE) A) and B)
F) A) and C)

Question 18

In a post office, the mailboxes are numbered from 1 to 4,500. These numbers represent

Accepted Answer

A)   categorical data.
B)   quantitative data.
C)   either categorical or quantitative data.
D)   since the numbers are sequential, the data is quantitative.E) A) and C)
F) B) and D)

Question 19

In a questionnaire, respondents are asked to mark their gender as male or female. The scale of measurement for gender is _____ scale.

Accepted Answer

A)   ordinal
B)   nominal
C)   ratio
D)   intervalE) A) and B)
F) A) and C)

Question 20

A statistics professor asked students in a class their ages. Based on this information, the professor states that the average age of all the students in the university is 24 years. This is an example of

Accepted Answer

A)   an observational study.
B)   descriptive statistics.
C)   an experiment.
D)   statistical inference.E) A) and D)
F) B) and C)

Exam 1: Data and Statistics

The number observations in a complete data set having 15 elements and 5 variables is

Correct AnswerverifiedB

Categorical data

Correct AnswerverifiedShow Answer

In a sample of 1,600 registered voters, 912 or 57% approve of the way the President is doing his job. The 57% approval is an example of

Correct AnswerverifiedShow Answer

Data measured a nominal scale

Correct AnswerverifiedB

Data collected over several time periods are _____ data.

Correct AnswerverifiedShow Answer

The numbers on football jerseys are an example of _____ data.

Correct AnswerverifiedShow Answer

Goals scored in a soccer game is an example of

Correct AnswerverifiedB

Statistical studies in which researchers control variables of interest are _____ studies.

Correct AnswerverifiedShow Answer

In a questionnaire, respondents are asked to mark their marital status as single, married, divorced, or widowed. Marital status is an example of a(n) _____ variable.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is a categorical variable?

Correct AnswerverifiedShow Answer

The type of analytics whose models yield a best course of action to take is _____ analytics.

Correct AnswerverifiedShow Answer

The set of measurements collected for a particular element are called

Correct AnswerverifiedShow Answer

Dr. Kurt Thearling, a leading practitioner in the field, defines data mining as "the _____ extraction of _____ information from databases."

Correct AnswerverifiedShow Answer

In a random sample of 200 items, 5 items were defective. An estimate of the percentage of defective items in the population is

Correct AnswerverifiedShow Answer

Arithmetic operations are inappropriate for

Correct AnswerverifiedShow Answer

The scale of measurement that is used to rank order the observation for a variable is called the _____ scale.

Correct AnswerverifiedShow Answer

In a post office, the mailboxes are numbered from 1 to 4,500. These numbers represent

Correct AnswerverifiedShow Answer

In a questionnaire, respondents are asked to mark their gender as male or female. The scale of measurement for gender is _____ scale.

Correct AnswerverifiedShow Answer

A statistics professor asked students in a class their ages. Based on this information, the professor states that the average age of all the students in the university is 24 years. This is an example of

Correct AnswerverifiedShow Answer

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Dr. Kurt Thearling, a leading practitioner in the field, defines data mining as "the _ extraction of _ information from databases."

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