The difference between before-after and controlled before-after experimental design is that the _____.
A) controlled before-after design is meant specifically for primary research
B) before-after design is meant specifically for primary research
C) controlled before-after design involves not one group, but two
D) before-after design eliminates the possibility of other variables influencing the results
E) before-after design measures the variables to be tested before the experiment begins

Question

Quizplus · Accepted Answer

The controlled before-after design involves both a control group and an experimental group, while the before-after design only has one group. This allows for better control of external variables that could influence the results, making it a stronger experimental design. None of the other answer choices accurately describe the difference between the two designs.

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