Biology Forums - Study Force

In an important study of the effectiveness of audiotapes that contain subliminal messages that is described in the textbook, researchers cleverly anticipated the placebo effect by adding another independent variable to the experiment. Specifically, some participants
A) were told that the tapes would not work.
B) listened to tapes that were mismarked.
C) heard messages that were clearly audible.
D) were paid to show the desired behavior.

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Such a helpful forum member, thank you so much.

Pleasure to help :)