STT 231 EXAM 1 REVIEW (PRACTICE PROBLEMS) | QUESTIONS AND
ANSWERS | 2026 UPDATED - RATED 100% CORRECT.
E. B and C - (answer)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 - (answer)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
, STT 231 EXAM 1 REVIEW (PRACTICE PROBLEMS) | QUESTIONS AND
ANSWERS | 2026 UPDATED - RATED 100% CORRECT.
(Lies in the middle of the 20 values) - (answer)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) - (answer)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
ANSWERS | 2026 UPDATED - RATED 100% CORRECT.
E. B and C - (answer)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 - (answer)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
, STT 231 EXAM 1 REVIEW (PRACTICE PROBLEMS) | QUESTIONS AND
ANSWERS | 2026 UPDATED - RATED 100% CORRECT.
(Lies in the middle of the 20 values) - (answer)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) - (answer)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
