Which of the following actions would best control for mediating variables when designing a study to determine whether a videotape or a pamphlet is most effective in educating young women about breast self-examination (BSE)?

Question

Quizplus · Accepted Answer

By excluding subjects who already perform BSE on a regular basis, the study controls for a potential mediating variable (i.e. baseline knowledge or behavior regarding BSE). Randomly assigning subjects to the different groups also helps control for other potential mediating variables, but it alone may not be sufficient. Selecting only heterosexual women and determining what breast cancer means to individual participants are not relevant to the research question and do not control for mediating variables.

Which of the Following Actions Would Best Control for Mediating