In a within-subjects experiment comparing two treatments, the researcher is concerned that the results may be confounded by outside events that occur between the first and second treatments. One way to reduce the likelihood that internal validity will be influenced by an outside event is to ____.
A) switch to a between-subjects design
B) increase the amount of time between the two treatments
C) switch the order of treatments
D) decrease the intensity of the treatment

Question

Quizplus · Accepted Answer

Switching to a between-subjects design eliminates the issue of outside events affecting the results, as each participant only experiences one treatment, thus reducing the risk of confounding variables impacting the internal validity.

In a Within-Subjects Experiment Comparing Two Treatments, the Researcher Is