Given a choice of the following research designs, which design controls the most threats to internal validity?
A) One-group posttest-only design
B) One group pretest-posttest design
C) Posttest-only design with nonequivalent groups
D) Pretest-posttest control group

Question

Quizplus · Accepted Answer

The pretest-posttest control group design controls the most threats to internal validity because it includes a control group that receives no treatment, but is evaluated at the same time as the experimental group. This allows for comparison between the two groups and helps control for history, maturation, testing, and regression to the mean. Additionally, the pretest helps identify any pre-existing differences between groups and allows for the assessment of whether the treatment had a significant effect.

Given a Choice of the Following Research Designs, Which Design