As a longitudinal experiment,Juan worked with two different groups,one who was receiving a special stress-reduction training,and another who was not.These two groups were matched together on important variables,and a pretest and posttest were both performed.However,he noticed that after sessions the individuals in the stress-reduction training were telling those in the control group about what they did each day.What form of internal invalidity is this?
A)compensation
B)compensatory rivalry
C)diffusion or imitation of treatments
D)demoralization
E)history

Question

Quizplus · Accepted Answer

Diffusion or imitation of treatments occurs when individuals in the control group become aware of the treatment being received by the experimental group and try to replicate it. In this case, it seems that individuals in the stress-reduction training group were talking about their experiences with those in the control group, potentially leading to diffusion of the treatment.

As a Longitudinal Experiment,Juan Worked with Two Different Groups,one Who