Quasi experimental designs that involve two preexisting groups have as a problem that
A) The focus is entirely on individuals
B) Alternative hypotheses cannot ever be ruled out
C) Differences between the groups may have existed before the experiment started
D) They are by definition confounded

Question

Quizplus · Accepted Answer

Quasi-experimental designs that involve two pre-existing groups have the issue that the differences between the groups may have existed before the experiment started. This could result in the outcome being influenced by the pre-existing differences rather than the experimental manipulation. Therefore, it is difficult to attribute any differences observed between the groups to the experimental intervention.

Quasi Experimental Designs That Involve Two Preexisting Groups Have as a Problem