When a student scores extremely poorly on one examination but then improves on the next,he or she demonstrates what statisticians call

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Regression toward the mean is the tendency for extreme scores or behaviors to become less extreme over time. Therefore, if a student scores extremely poorly on one exam and then improves on the next, it is likely due to regression toward the mean rather than random fluctuation or a rebound effect. The law of regular deviations is not a commonly used statistical term.

When a Student Scores Extremely Poorly on One Examination but Then