A "captive" population of potential participants for comparing the effectiveness of a pamphlet versus a videotape in teaching young men how to perform testicular self-examination indicates what?

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A captive population refers to a group that can be easily accessed and recruited for a study. In this case, a high school health education class would be a captive population as the students are already in the classroom and can be easily asked to participate in the study. The other options (B, C, and D) are not captive populations because they require outreach or recruitment efforts to access potential participants.

A "Captive" Population of Potential Participants for Comparing the Effectiveness