19. A statistics professor asked students in a class their weight. The professor

Question

19. A statistics professor asked students in a class their weight. The professor states that the average weight of all the students in the university is 150 lbs. This is an example of: A. a census B. descriptive statistics C. an experiment D. statistical inference

20. If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true: A. the data set is a sample B. the data set is a population C. the data set could be either a sample or a population D. the data set is from a census

21. Which of the following pairs of events (A and B) are mutually exclusive? A. A = studying 7 hours a day. B = sleeping 15 hours a day. B. A = swimming a mile each day. B = having a full-time job. C. A = playing professional basketball. B = making a million dollars. D. A = running. B = playing soccer.

Explanation / Answer

19)

ANSWER:

D. statistical inference

20)

ANSWER:   

A. the data set is a sample

21)

ANSWER:

C. A = playing professional basketball. B = making a million dollars

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