Which experimental design provides the best defense against the threats to internal validity?
A) After-only case study
B) Static group comparison
C) One-group pretest-posttest
D) Nonequivalent control group
E) Pretest-posttest control group

Question

Quizplus · Accepted Answer

The pretest-posttest control group design provides the best defense against the threats to internal validity because it includes a control group which helps to control for extraneous variables, and it includes both a pretest and posttest to measure any changes in the dependent variable. This design also allows for random assignment to the control and experimental groups which strengthens the internal validity of the study.

Which Experimental Design Provides the Best Defense Against the Threats