7.A manipulation is when a researcher makes slight changes to a stimulus.

A. True

B. False

8.Convenience samples:

a.

take place at 7-11, Stop & Go or other convenience stores

b.

are nonprobability samples

c.

are typically not representative of the entire population

d.

Both a and b

e.

Both b and c

9. The distinguishing feature of probability samples is that:

A.they involve personal judgment somewhere in the selection of sample elements

B.each population element has an equal chance of being included in the sample and every combination of n population element is a sample possibility

C.each population element has a known chance of being included in the sample

D.they will always be more representative of the population than nonprobability samples

E.each population element has an equal chance of being included in the sample

10. While giving guidelines to her field interviewing staff, a researcher states, "I want you to interview every tenth customer entering a K-Mart store at the following key sites." This is an example of __ sampling.

systematic

sequential

convenience

judgment

quota

11. Graphics Rating Scales' ability to provide infinite rating responses to a particular question is desirable in all situations.

True

False

12. When we repeat a measurement on an individual or group of individuals and do not get the same score as the first time we did the measurement (assuming the characteristic being measured has not changed), a ___ error is present

systematic

researcher

random

scaling

13.Providing a "Don't know" or "Not applicable" response allows respondents to opt-in.

True

False