The experimental and control groups should be the same in every respect except for
A) the number of subjects in each group.
B) the variation created by the manipulation of the independent variable.
C) the assumptions underlying the research question.
D) the method of measuring the dependent variable.

Question

Quizplus · Accepted Answer

The key factor distinguishing the experimental and control groups is the manipulation of the independent variable, which creates variation between the groups. All other aspects, such as the number of subjects, measurement of the dependent variable, and assumptions underlying the research question, should be kept the same between the two groups in order to isolate the effects of the independent variable.

The Experimental and Control Groups Should Be the Same in Every