Control group contamination can occur when
A) participants in the control group learn about the treatment being given to the experimental group and try to apply it to themselves.
B) practitioners working with the placebo control group actually administer a treatment.
C) members of the control group feel a rivalry with members of the experimental group.
D) any of the above situations occur.

Question

Quizplus · Accepted Answer

Control group contamination refers to any situation where the control group is influenced by or has access to the treatment intended only for the experimental group. This can happen through information exchange among participants, unintended treatment administration by practitioners, or competitive behaviors that lead to changes in the control group's behavior or condition. Thus, all the options listed (A, B, and C) are instances where control group contamination could occur.

Control Group Contamination Can Occur When