Essay

Using the example of the amateur bowler, recall the definition of regression to the mean and explain what statistical probability suggests will happen to her score after she bowls an exceptionally high game of 220220.

Question: Using the example of the amateur bowler, recall the definition of regression to the mean and explain what statistical probability suggests will happen to her score after she bowls an exceptionally high game of 220220.

Sample answer: Regression to the mean is the statistical phenomenon where extreme performances or scores are usually followed by more typical, average results. In the example of the amateur bowler who typically averages a score of 150150, if she suddenly bowls an exceptionally high game of 220220, statistical probability suggests her next game will be significantly lower. It will regress back toward her long-term average of 150150 because the extreme score was a natural fluctuation rather than a permanent improvement or decline.

Key points:

  • Define regression to the mean as extreme scores being followed by more typical, average results.
  • State that the bowler's typical average is 150150 and her extreme score is 220220.
  • Predict that the next score will be significantly lower, regressing toward 150150.
  • Explain that the regression is due to natural fluctuation rather than permanent improvement or decline.

Rubric: A complete response must: 1. Define regression to the mean as extreme performances being followed by more typical, average results. 2. Reference the bowler's average score of 150150 and the extreme score of 220220. 3. State that statistical probability predicts the next game will be significantly lower and regress toward the mean. 4. Explain that this represents a natural fluctuation rather than a permanent change.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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