Which assumption regarding cause-and-effect is violated in a quasi-experimental design?
A) the assumption of no diffusion of treatment
B) the assumption of equal groups before the experiment
C) the assumption of no statistical regression
D) the assumption of no history effects

Question

Quizplus · Accepted Answer

In a quasi-experimental design, the assumption of equal groups before the experiment is violated because participants are not randomly assigned to groups, which can lead to differences between groups that affect the outcome.

Which Assumption Regarding Cause-And-Effect Is Violated in a Quasi-Experimental Design