If participants in one treatment group become familiar with the treatment of another group and copy that treatment, the experiment has low internal validity due to
A) selection.
B) maturation.
C) statistical regression.
D) diffusion of treatment.

Question

Quizplus · Accepted Answer

Diffusion of treatment occurs when participants in different groups communicate and share information about their treatments, leading to contamination and reducing the internal validity of the experiment.

If Participants in One Treatment Group Become Familiar with the Treatment