STATISTICS ELITE REVIEW STUDY GUIDE
SUMMARY WITH SOLVED QUESTIONS AND
DETAILED VERIFIED ANSWERS FOR 2026
SUCCESS
◉a school principal wanted to investigate student opinion about the food
served in the school cafeteria. the principal selected at random samples
of 50 first-year students, 50 second-year students, 50 third-year students,
and 50 fourth-year students to complete a questionnaire. Which of the
following best describes the principal's sampling plan?
A. a stratified random sample
B. a simple random sample
C. a cluster sample
D. a convenience sample
E. a systematic sample. Answer: A
◉a candy company produces individually wrapped candies. The quality
control manager for the company believes that the weight of the candies
is approximately normally distributed with mean 720 milligrams (mg). If
the manager's belief is correct, which of the following intervals of
weights will contain the largest proportion of the candies in the
distribution of weights?
A. 740 mg to 780 mg
, B. 700 mg to 740 mg
C. 680 mg to 720 mg
D. 660 mg to 700 mg
E. 620 mg to 660 mg. Answer: B
◉a company currently uses Brand A lightbulbs, which have a mean life
of 1,000 hours. a salesperson marketing Brand B, a new brand of bulb,
contacts the company. the company will switch to the new brand of bulb
only if there is convincing evidence that the mean life of Brand B is
greater than 1,000 hours. What should the hypotheses for the company
test be?. Answer: Ho: the mean life of Brand B is 1,000 hours
Ha: the mean life of Brand B bulbs is more than 1,000 hours
◉a graph (not shown) of the selling prices of homes in a certain city for
the month of April reveals that the distribution is skewed to the left.
Which of the following statements is the most reasonable conclusion
about the selling prices based on the graph?
A. the mean is greater than the median
B. the median is the average of the first quartile and the third quartile
C. there are fewer selling prices between the first quartile and the
median than there are between the median and the third quartile
D. there are more selling prices that are less than the mean than selling
prices that are greater than the mean
E. the value of maximum minus third quartile is less than the value of
first quartile minus minimum. Answer: E
SUMMARY WITH SOLVED QUESTIONS AND
DETAILED VERIFIED ANSWERS FOR 2026
SUCCESS
◉a school principal wanted to investigate student opinion about the food
served in the school cafeteria. the principal selected at random samples
of 50 first-year students, 50 second-year students, 50 third-year students,
and 50 fourth-year students to complete a questionnaire. Which of the
following best describes the principal's sampling plan?
A. a stratified random sample
B. a simple random sample
C. a cluster sample
D. a convenience sample
E. a systematic sample. Answer: A
◉a candy company produces individually wrapped candies. The quality
control manager for the company believes that the weight of the candies
is approximately normally distributed with mean 720 milligrams (mg). If
the manager's belief is correct, which of the following intervals of
weights will contain the largest proportion of the candies in the
distribution of weights?
A. 740 mg to 780 mg
, B. 700 mg to 740 mg
C. 680 mg to 720 mg
D. 660 mg to 700 mg
E. 620 mg to 660 mg. Answer: B
◉a company currently uses Brand A lightbulbs, which have a mean life
of 1,000 hours. a salesperson marketing Brand B, a new brand of bulb,
contacts the company. the company will switch to the new brand of bulb
only if there is convincing evidence that the mean life of Brand B is
greater than 1,000 hours. What should the hypotheses for the company
test be?. Answer: Ho: the mean life of Brand B is 1,000 hours
Ha: the mean life of Brand B bulbs is more than 1,000 hours
◉a graph (not shown) of the selling prices of homes in a certain city for
the month of April reveals that the distribution is skewed to the left.
Which of the following statements is the most reasonable conclusion
about the selling prices based on the graph?
A. the mean is greater than the median
B. the median is the average of the first quartile and the third quartile
C. there are fewer selling prices between the first quartile and the
median than there are between the median and the third quartile
D. there are more selling prices that are less than the mean than selling
prices that are greater than the mean
E. the value of maximum minus third quartile is less than the value of
first quartile minus minimum. Answer: E
