The posttest-only control-group design
A) suffers from the selection threat to internal validity.
B) suffers from the statistical regression threat to internal validity.
C) suffers from the history threat to internal validity.
D) allows cause-and-effect statements to be made.

Question

Quizplus · Accepted Answer

The posttest-only control-group design allows for cause-and-effect statements because it includes a control group and random assignment, which help control for threats to internal validity.

The Posttest-Only Control-Group Design