Which of these variables should not be included in the placebo group of a between-subjects experiment?
A) all extraneous factors
B) experiment-wide demand characteristic effects
C) treatment nonspecific effects
D) treatment-specific demand characteristic effects

Question

Quizplus · Accepted Answer

Treatment-specific demand characteristic effects should not be included in the placebo group of a between-subjects experiment because they are directly related to the specific treatment being tested, and including them in the placebo group would contaminate the control conditions by introducing expectations or behaviors specific to the treatment rather than maintaining a neutral comparison group.

Which of These Variables Should Not Be Included in the Placebo