What is one of the primary advantages of a Pretest-posttest nonequivalent control group design, in comparison to other nonequivalent group designs?
A) Posttest scores can help reduce threats from history effects.
B) Posttest scores can eliminate threats from history effects.
C) Pretest scores can help reduce the threat to internal validity that comes from individual differences.
D) Pretest scores can eliminate the threat to internal validity that comes from individual differences.

Question

Quizplus · Accepted Answer

Pretest scores allow researchers to account for differences between groups that existed before the intervention, thereby reducing the impact of individual differences on the study's internal validity. This does not eliminate the threat but helps in controlling for it, making comparisons between groups more valid.

What Is One of the Primary Advantages of a Pretest-Posttest