Of the nearly 6,000 people who participated in the National Survey of Sexual Health and Behavior (NSSHB), which is a survey on sexual behaviors:
A) all had volunteered to be in the survey by responding to advertisements.
B) each was randomly assigned to the different experimental conditions in the study.
C) each was randomly selected from the entire U.S. population.
D) almost all were from either California or New York.

Question

Quizplus · Accepted Answer

A national survey is typically conducted by randomly selecting participants from a representative sample of the entire population. This ensures that the sample is not biased towards any particular group or region, and that the results can be generalized to the entire population. Option A is incorrect because only those who volunteered to participate would have responded to advertisements. Option B is also incorrect because if participants were randomly assigned to different experimental conditions, it would suggest that the study had experimental manipulations, which is not mentioned in the question stem. Option D is incorrect because it suggests that the sample was not representative of the entire population, but rather biased towards two particular regions of the US.

Of the Nearly 6,000 People Who Participated in the National