Which of the Following Actions Would Best Control for Mediating

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) ?

A) Randomly assigning subjects to the two groups
B) Excluding subjects who already perform BSE on a regular basis
C) Selecting only heterosexual women as study subjects
D) Determining what breast cancer means to individual participants

Correct Answer:

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