People do better on a task because of practice on that task. However, the researcher mistakes this practice effect for a treatment effect. The research's internal validity is poor due to
A) history
B) instrumentation
C) mortality
D) testing

Question

Quizplus · Accepted Answer

The testing effect refers to the improvement in performance due to repeated exposure to the same test or task, which can be mistaken for a treatment effect, thus affecting internal validity.

People Do Better on a Task Because of Practice on That