A professor records the scores for 10 students who took a midterm and a makeup midterm exam. She finds that scores improved on the makeup exam. Which two types of threats to internal validity may influence this result?
What will be an ideal response?
Ans: Regression toward the mean and testing effect
Learning Objective: 7-5: Describe factors that threaten the internal validity of a research study.
Cognitive Domain: Application
Answer Location: Regression and Testing Effects
Difficulty Level: Moderate
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