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

Scottie Johnson · Accepted Answer

Final Answer : C, Explanation :  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.

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