STA 271 Exam 1 Review 2025 – Complete
Study Guide & Practice Questions REAL
EXAM!! 2025
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?
A. The county of residence
B. The number of people, both adults and children, living in the household
C. The total household income, before taxes, in 2020
D. The age of the respondent - ANSWER ✔---A (The county of residence)
A description of different houses on the market includes the following three variables. Which of these
variables is quantitative?
A. The square footage of the house
B. The monthly gas bill
C. The monthly electric bill
D. All of the above - ANSWER ✔---D (All of the above)
A variable is a characteristic of a:
,A. case
B. label
C. value
D. None of the above - ANSWER ✔---A (case)
Categorical variables place cases into ____ group(s).
A. one
B. no
C. many
D. numeric - ANSWER ✔---C (many)
Variables on which arithmetic operations do not make sense are called _______.
A. quantitative
B. categorical
C. distributions
D. cases - ANSWER ✔---B (categorical)
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?
A. Quantitative
B. Categorical
C. Quantitative and categorical
D. None of the above - ANSWER ✔---B (Categorical)
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?
A. Quantitative
B. Categorical
C. Quantitative and categorical
, D. None of the above - ANSWER ✔---A (Quantitative)
Units of measurement are an important part of the description of what type of variables?
A. Quantitative
B. Categorical
C. Quantitative and categorical
D. None of the above - ANSWER ✔---A (Quantitative)
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?
A. one
B. two
C. three
D. five - ANSWER ✔---C (three)
Categorical variables are best displayed by ______.
A. histograms
B. pie charts
C.bar graphs or histograms
D. pie charts or bar graphs - ANSWER ✔---D (pie charts or bar graphs)
Quantitative variables are best displayed using _______.
A. stemplots
B. histograms
C. bar graphs or stemplots
D. stemplots or histograms - ANSWER ✔---D (stemplots or histograms)
Study Guide & Practice Questions REAL
EXAM!! 2025
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?
A. The county of residence
B. The number of people, both adults and children, living in the household
C. The total household income, before taxes, in 2020
D. The age of the respondent - ANSWER ✔---A (The county of residence)
A description of different houses on the market includes the following three variables. Which of these
variables is quantitative?
A. The square footage of the house
B. The monthly gas bill
C. The monthly electric bill
D. All of the above - ANSWER ✔---D (All of the above)
A variable is a characteristic of a:
,A. case
B. label
C. value
D. None of the above - ANSWER ✔---A (case)
Categorical variables place cases into ____ group(s).
A. one
B. no
C. many
D. numeric - ANSWER ✔---C (many)
Variables on which arithmetic operations do not make sense are called _______.
A. quantitative
B. categorical
C. distributions
D. cases - ANSWER ✔---B (categorical)
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?
A. Quantitative
B. Categorical
C. Quantitative and categorical
D. None of the above - ANSWER ✔---B (Categorical)
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?
A. Quantitative
B. Categorical
C. Quantitative and categorical
, D. None of the above - ANSWER ✔---A (Quantitative)
Units of measurement are an important part of the description of what type of variables?
A. Quantitative
B. Categorical
C. Quantitative and categorical
D. None of the above - ANSWER ✔---A (Quantitative)
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?
A. one
B. two
C. three
D. five - ANSWER ✔---C (three)
Categorical variables are best displayed by ______.
A. histograms
B. pie charts
C.bar graphs or histograms
D. pie charts or bar graphs - ANSWER ✔---D (pie charts or bar graphs)
Quantitative variables are best displayed using _______.
A. stemplots
B. histograms
C. bar graphs or stemplots
D. stemplots or histograms - ANSWER ✔---D (stemplots or histograms)
