A researcher wants to obtain a sample of individuals who are HIV positive. Which of the following sampling methods would be the most effective way to obtain a sample?
a. Accidental sampling
b. Cluster sampling
c. Network sampling
d. Simple random sampling
ANS: C
Network sampling is useful for locating samples difficult or impossible to obtain in other ways. Network sampling takes advantage of social networks and the fact that friends tend to have characteristics in common.
Accidental or convenience sampling would not be likely to yield an adequate sample of HIV-positive individuals.
Cluster sampling would not be the best method for finding the desired sample in this case.
Simple random sampling would not work well because the researcher is looking for a specific subgroup of the general population.
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