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AP Psychology
Free Response

Understanding Correlation and Regression in Sleep and GPA Study

Very Hard Research Design And Analysis Statistical Concepts

Researchers are interested in understanding the relationship between sleep quality and academic performance among college students. They conduct a study involving 200 participants from various universities, measuring the students' average hours of sleep per night and their GPAs at the end of the semester. To analyze the data, they employ both correlation analysis and regression analysis.

In your response, address the following:

  • Explain the differences between correlation and regression analysis.
  • Identify the appropriate statistical method for determining whether sleep quality significantly predicts academic performance and justify your choice.
  • Discuss potential confounding variables in this study and how they might influence the results.
  • Describe what it would mean if the researchers found a high positive correlation between sleep and GPA but no significant regression coefficient.

Note: The provided solution includes an example of a perfect-score answer and explanation. Your response will not be scored.

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