Statistical regression refers to the fact that extreme scores tend to move toward the average upon second testing.

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Statistical regression, also known as regression to the mean, is a well-known statistical phenomenon in which extreme values on a variable tend to move closer to the mean upon a second measurement. This occurs because extreme values are often the result of random fluctuations that are unlikely to be sustained over time. As a result, upon retesting, extreme scores tend to shift closer to the average score on the variable.

Statistical Regression Refers to the Fact That Extreme Scores Tend