A student asks 27 of her friends to tell her their grade point averages (GPA). This student writes down only the answers

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A student asks 27 of her friends to tell her their grade point
averages (GPA). This student writes down only the answers and not
the name of the friend with whom she is speaking, and she reports
on the average GPA of her friends. This survey is considered to be
Select one:
a. anonymous
b. confidential
c. both anonymous and confidential
d. neither anonymous nor confidential
A recently conducted poll omitted people without telephones, and
it also left out Alaska and Hawaii residents to reduce cost. These
omissions may cause a small bias. If so, that bias is Select
one:
a. a sampling error
b. a nonsampling error
c. due to voluntary response
d. due to absence of a control group.
Which of the following is NOT a potential problem with Internet
surveys? Select one:
a. Voluntary response
b. Multimedia content
c. Undercoverage
d. Nonresponse
It is thought that 63.7% of the student body owns a school
sweatshirt. A student reports that from a simple random sample of
1000 students, 637 own a school sweatshirt. Select one:
a. This should be trusted since it matches exactly what was
thought.
b. It is highly unlikely that an SRS would yield results exactly
matching what was expected.
c. Thus, 6.37% of the sample own a school sweatshirt, which
refutes the original thought.
d. The student didn’t get IRB approval, so the results are
invalid.