The distinguishing feature of nonprobability sampling plans is that
a. they allow an assessment of sampling error.
b. they are not as representative of the population as probability samples.
c. they involve personal judgment somewhere in the selection of sample elements.
d. there is only one basic type of nonprobability sample while there are several types of probability samples.
e. they tend to be more expensive than probability samples.
Question 2A researcher collects a small sample and finds that he does not have sufficient evidence to draw a conclusion. He then takes additional observations and finds this evidence inconclusive. He continues making observations until a conclusion can be drawn. He is using
a. random sampling.
b. fixed sampling.
c. sequential sampling.
d. the principle of diminishing utility.
e. nonprobability sampling.
Question 3A __________ allows trends in the data to be evaluated as the data are being collected.
a. fixed sample
b. sequential sample
c. probability sample
d. nonprobability sample
e. random sample
Question 4If the number of elements to be sampled is not decided in advance, but determined by a series of decisions as the data are collected, the sample is
a. sequential.
b. quota.
c. accidental.
d. fixed.
e. None of the above are correct.
Question 5Which of the following statements is CORRECT?
a. A low incidence means that a high percentage of the general population of interest qualifies for inclusion in the study.
b. A low incidence means that a low percentage of the general population is expected to respond to the study.
c. A low incidence means that a low percentage of the general population qualifies for inclusion in the study.
d. A low incidence means that a low percentage of the general population will participate in the study.
e. None of the above are true statements.
Question 6In order to define a population, the researcher needs to specify
a. the geographic boundaries of the population.
b. which elements are not of interest.
c. the time period for the study.
d. Both a and b.
e. a, b, and c.
Question 7In the context of sampling, incidence refers to
a. the percent of the general population that qualifies for inclusion in the sample.
b. a method of probability sampling.
c. the percent of the sample that exhibits the characteristic(s) under investigation.
d. a method of nonprobability sampling.
e. the percentage of elements in the sampling frame having the characteristic.
Question 8Which of the following is NOT a problem with using a phone book for a sampling frame?
a. Unlisted phone numbers.
b. Not all homes have phones.
c. Double counting homes with multiple phone numbers.
d. The phone book is always outdated.
e. All of the above are problems when sampling from phone books.
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