19. A statistics professor asked students in a class their weight. The professor
ID: 3253676 • Letter: 1
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.
22.
If 12 babies are born, how many different gender sequences are possible?
A. 1096
B. 4096
C. 479,001,600 D. 144
Explanation / Answer
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
22) 2^12 = 4096
B) is correct
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