STT 231 Exam 1 Review QUESTIONS &
ANSWERS(RATED A+)
E. B and C - ANSWERA 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 - ANSWERA 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) - ANSWERData 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) - ANSWERWhich
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) - ANSWERThe 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
C. Skewed to the right
D. Bimodal
B. 175 219.5 299 350 549
(Five-number summary consists of the minimum, 1st Quartile, Median, 3rd Quartile, and
maximum) - ANSWER175 199 205 234 259 275 299 304 317 345 355 384 549
What is the five-number summary?
A. 175 234 299 345 549
B. 175 219.5 299 350 549
C. 175 219.5 299 350 384
D. 175 234 299 331 549
C. One outlier: 549 - ANSWER175 199 205 234 259 275 299 304 317 345 355 384 549
ANSWERS(RATED A+)
E. B and C - ANSWERA 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 - ANSWERA 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) - ANSWERData 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) - ANSWERWhich
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) - ANSWERThe 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
C. Skewed to the right
D. Bimodal
B. 175 219.5 299 350 549
(Five-number summary consists of the minimum, 1st Quartile, Median, 3rd Quartile, and
maximum) - ANSWER175 199 205 234 259 275 299 304 317 345 355 384 549
What is the five-number summary?
A. 175 234 299 345 549
B. 175 219.5 299 350 549
C. 175 219.5 299 350 384
D. 175 234 299 331 549
C. One outlier: 549 - ANSWER175 199 205 234 259 275 299 304 317 345 355 384 549
