The reason that ex post facto control group designs are not considered quasi-experimental is:
A) They lack control groups
B) They lack random assignment for control groups
C) Control groups are specified after treatment has occurred
D) They lack pretests
E) Subjects are allowed to self-select group membership

Question

Quizplus · Accepted Answer

Ex post facto control group designs, also known as retrospective control group designs, select the control group after the treatment has already occurred. This means that there is no random assignment to the control group, and therefore is not considered a true experimental design. The lack of random assignment for control groups is the key reason why ex post facto control group designs are not considered quasi-experimental.

The Reason That Ex Post Facto Control Group Designs Are