A census differs from a sample survey because
A.
in a sample survey the whole population is
measured.
B.
a census is only done when measuring the units
will destroy them.
C.
a sample survey is only done when measuring
the units will destroy them.
D.
in a census the whole population is measured.
A census is designed to measure the entire population while a sample is a subgroup of the
population
Points Earned:
1/1
Correct Answer:
D
Your Response:
D
2.
A surveytaker randomly selected 1000 students who were studying in the library and found that
90% of these students were in favor of longer library hours. The results of this study, if applied
to all students in the university, are questionable because of
A.
response bias.
B.
selection bias.
C.
lack of accuracy.
D.
nonresponse bias.
The survey sample only looked at those students who were studying in the library which would
not necessarily represent ALL students, so the study would be questionable due to selection bias
Points Earned:
1/1
Correct Answer:
B
Your Response:
B
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3.
A recent poll reported that 62% of all college students believe there is extraterrestrial life. The
95% margin of error for the poll was 4%. Which of the following statements is correct?
A.
The chance is 5% that at least 62% of all college
students believe there is extraterrestrial life.
B.
We can be certain that the percentage of all
college students who believe there is
extraterrestrial life is in the interval 58% to
66%.
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 '08
 BARROSO,JOAOR
 Statistics, Correct Answer, a. b. c., A. B. C. D

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