The difference between before-after and controlled before-after experimental design is that:
A) the controlled before-after design is meant specifically for primary research.
B) the before-after design is meant specifically for primary research.
C) the controlled before-after design involves not one group, but two.
D) the first step involved in the controlled before-after design is the selection of an experimental group.
E) the before-after design measures the variables to be tested before the experiment begins.

Question

Quizplus · Accepted Answer

In controlled before-after design, there are two groups- an experimental group that receives the treatment and a control group that does not. In contrast, the before-after design only measures the variables to be tested before and after the experiment with a single group. Therefore, option C is the correct choice.

The Difference Between Before-After and Controlled Before-After Experimental Design Is