A group of college students is participating in a memory study that involves performing the same task each day under different circumstances; however, as each day goes by, the students are obviously getting more comfortable with completing the task. Which threat to internal validity has confounded this study?
A) History
B) Selection bias
C) Practice
D) Fatigue

Question

Quizplus · Accepted Answer

The confounding variable in this study is likely practice, as the students are becoming more comfortable with the task as the study goes on. This could lead to improved performance on the task over time, which could affect the results of the study.

A Group of College Students Is Participating in a Memory