Of the following experimental designs, the strongest in external validity is the
A) one-shot case study.
B) one-group pretest-posttest design.
C) posttest-only control-group design.
D) pretest-posttest control-group design.

Question

Quizplus · Accepted Answer

The posttest-only control-group design is considered strong in external validity because it includes a control group, which helps in generalizing the results to a larger population by reducing the influence of confounding variables.

Of the Following Experimental Designs, the Strongest in External Validity