Which of the following best addresses the nature of the threat to internal validity that is caused by testing effects?
A) participants' scores changing on subsequent measurements simply because of their increased familiarity
B) the differential dropping out of the participants from a study
C) an unexpected or unrelated event occurring during the study that could influence responses
D) physiological changes occurring in participants during the course of the study

Question

Quizplus · Accepted Answer

Testing effects threaten internal validity due to participants' scores changing on subsequent measurements, often because they become more familiar with the test material or the testing process itself. This can lead to improvements or changes in scores that are not due to the experimental manipulation or treatment.

Which of the Following Best Addresses the Nature of the Threat