Test Bank for Introduction to the Practice of Statistics, 10e

Test Bank for Introduction to the Practice of Statistics, 10e David Moore, George McCabe, Bruce Craig (All Chapters)

Chapter_1

• A study is conducted on students taking a statistics class. Several variables are recorded in the survey.

Identify each variable as categorical or quantitative.

• The type of car the student owns
• The number of credit hours taken during that semester
• The time the student waited in line at the bookstore to pay for his or her textbooks
• The home state of the student

ANSWER: A. Categorical, B. Quantitative, C. Quantitative, D. Categorical

• Researchers are conducting a state-wide survey for the U.S. Postal Service. The survey records many

different variables of interest. Which of the following variables is categorical?

• The county of residence
• The number of people, both adults and children, living in the household
• The total household income, before taxes, in 2020
• The age of the respondent

ANSWER: a

• A particularly common question in the study of wildlife behavior involves observing contests between

“residents” of a particular area and “intruders.” In each contest, the residents either win or lose the encounter (assuming there are no ties). Observers might record several variables, some of which are listed below. Which of these variables is categorical?

• The duration of the contest (in seconds)
• The number of animals involved in the contest
• Whether the residents win or lose
• The total number of contests won by the residents

ANSWER: c

• A description of different houses on the market includes the following three variables. Which of these

variables is quantitative?

• The square footage of the house
• The monthly gas bill
• The monthly electric bill
• All of the above

ANSWER: d

• Jason is buying a smartphone. He is comparing various models using many different variables. These

variables will play an important role as he decides which smartphone he will buy. Identify each of the following variables as categorical or quantitative.

• Does the smartphone have fast-charging capability?
• How many megapixels does the front-facing camera have?
• What operating system does the smartphone use?
• How much does the smartphone cost? 1 / 4

ANSWER: A. Categorical, B. Quantitative, C. Categorical, D. Quantitative

6. A variable is a characteristic of a:

• case.
• label.
• value.
• None of the above

ANSWER: a

• Categorical variables place cases into ____ group(s).
• one
• no
• many
• numeric

ANSWER: c

• Variables that take numeric values for which arithmetic operations make sense are called _______.
• quantitative
• categorical
• distributions
• cases

ANSWER: a

• Variables on which arithmetic operations do not make sense are called _______.
• quantitative
• categorical
• distributions
• cases

ANSWER: b

• Variables take on ________.
• values
• cases
• distributions
• None of the above

ANSWER: a

• What are labels used for in data sets?
• To identify distributions
• To identify values
• To identify cases
• None of the above

ANSWER: c

• / 4

• We have a data set where the cases are college students. One of the variables in the data set is “gender.” The

values of gender are 1 if the student is male and 2 if the student is female. What type of variable is gender?

• Quantitative
• Categorical
• Quantitative and categorical
• None of the above

ANSWER: b

• We have a data set where the cases are college students. One of the variables in the data set is “age of the

student.” What type of variable is age of the student?

• Quantitative
• Categorical
• Quantitative and categorical
• None of the above

ANSWER: a

• We have a data set where the cases are college students. One of the variables in the data set is “hometown.”

What type of variable is hometown?

• Quantitative
• Categorical
• Quantitative and categorical
• None of the above

ANSWER: b

• Units of measurement are an important part of the description of what type of variables?
• Quantitative
• Categorical
• Quantitative and categorical
• None of the above

ANSWER: a

• Is the distribution shown below unimodal?

• No
• Yes

ANSWER: a

• Suppose you are interested in comparing the quality of different hospitals based on infections that have

occurred from surgery. Which of the following would be the better way to measure such a variable?

• Rate of infections
• Count of infections 3 / 4

• None of the above

ANSWER: a

• Suppose you own a pizza delivery company and you are trying to determine the best campus on which to

sell pizza. What would be the best measurement to make the comparison?

• Average number of pizzas purchased
• Count of pizzas purchased
• Rate of pizzas purchased
• None of the above

ANSWER: b

• The first day of class, the professor collects information on each student to make a data set that will be

analyzed throughout the semester. The information asked includes hometown, GPA, number of classes, number of siblings, and favorite subject. How many variables are in this data set?

• 1
• 2
• 5
• None of the above

ANSWER: c

• The first day of class, the professor collects information on each student to make a data set that will be

analyzed throughout the semester. The information asked includes hometown, GPA, number of classes taking, number of siblings, and favorite subject. How many quantitative variables are in this data set?

• one
• two
• three
• five

ANSWER: c

• The first day of class, the professor collects information on each student to make a data set that will be

analyzed throughout the semester. The information asked includes hometown, GPA, number of classes taking, number of siblings, and favorite subject. How many categorical variables are in this data set?

• one
• two
• three
• four

ANSWER: b

• The first day of class, the professor collects information on each student to make a data set that will be

analyzed throughout the semester. The information asked includes hometown, GPA, number of classes taking, number of siblings, and favorite subject. What are the cases in this data set?

• The semester
• The professor
• The college students
• None of the above
• / 4