STT 231 Exam Review (Practice Problems)-
Questions and Answers | 2026 Update | 100%
Correct
E. B and C
A study is conducted on students taking a statistic class. Several variables are recorded in the
survey. Which variables are quantitative?
A. Type of car the student owns
B. Number of credit hours taken during that semester
C. The time the student waited in line at the bookstore to pay for his/her textbooks
D. Home state of the student
E. B and C
B. $14
(12+15+17+22+14)/5 = 16
A consumer group surveyed the prices for white cotton extra-long twin sheet sets in five
different department stores and reported the average price as $16. We visited four of the five
stores, and found the prices to be $12, $15, $17, and $22. Assuming that the consumer group is
,correct, what is the price of the item at the store that we did not visit?
A. $10
B. $14
C. $15
D. $17
C. 19.5
(Lies in the middle of the 20 values)
Data on the mileage of 20 randomly selected cars is listed below (ordered for convenience)
12 13 15 16 16 17 18 18 19 19 20 20 22 23 24 26 26 27 27 29
What is the median mileage for these 20 cars?
A. 17.5
B. 19
C. 19.5
D. 20
B. The scores of students on a very easy exam in which most score perfectly, but a few do
very poorly
, (When the mean is smaller than the median, that typically means a data set that is skewed
to the left, leaving the bulk of the scores in the upper range)
Which of the following is likely to have a mean that is smaller than the median?
A. The salaries of all NFL players
B. The scores of students on a very easy exam in which most score perfectly but a few do very
poorly
C. Test scores on a standardized test
D. The scores of students on a very difficult exam in which most score poorly, but a few do very
well
C. Skewed to the right
(Most of the data would be focused in the lower range, with few in the upper, making this
skewed to the right)
The salaries of MLB players range from several hundred thousand dollars per year to very few
earning in the millions. Suppose a histogram is made of all last year's salaries of major league
baseball players. Which shape would best describe the shape of this histogram?
A. Skewed to the left
B. Bell shaped
Questions and Answers | 2026 Update | 100%
Correct
E. B and C
A study is conducted on students taking a statistic class. Several variables are recorded in the
survey. Which variables are quantitative?
A. Type of car the student owns
B. Number of credit hours taken during that semester
C. The time the student waited in line at the bookstore to pay for his/her textbooks
D. Home state of the student
E. B and C
B. $14
(12+15+17+22+14)/5 = 16
A consumer group surveyed the prices for white cotton extra-long twin sheet sets in five
different department stores and reported the average price as $16. We visited four of the five
stores, and found the prices to be $12, $15, $17, and $22. Assuming that the consumer group is
,correct, what is the price of the item at the store that we did not visit?
A. $10
B. $14
C. $15
D. $17
C. 19.5
(Lies in the middle of the 20 values)
Data on the mileage of 20 randomly selected cars is listed below (ordered for convenience)
12 13 15 16 16 17 18 18 19 19 20 20 22 23 24 26 26 27 27 29
What is the median mileage for these 20 cars?
A. 17.5
B. 19
C. 19.5
D. 20
B. The scores of students on a very easy exam in which most score perfectly, but a few do
very poorly
, (When the mean is smaller than the median, that typically means a data set that is skewed
to the left, leaving the bulk of the scores in the upper range)
Which of the following is likely to have a mean that is smaller than the median?
A. The salaries of all NFL players
B. The scores of students on a very easy exam in which most score perfectly but a few do very
poorly
C. Test scores on a standardized test
D. The scores of students on a very difficult exam in which most score poorly, but a few do very
well
C. Skewed to the right
(Most of the data would be focused in the lower range, with few in the upper, making this
skewed to the right)
The salaries of MLB players range from several hundred thousand dollars per year to very few
earning in the millions. Suppose a histogram is made of all last year's salaries of major league
baseball players. Which shape would best describe the shape of this histogram?
A. Skewed to the left
B. Bell shaped
