Case Study

Based on this context, diagnose the type of distribution observed by the researcher and explain what this visual pattern demonstrates about the spread of sleep hours around the center of the dataset.

Case context: A psychologist studying sleep patterns plots the frequency distribution of the number of hours of sleep per night for a group of undergraduate students. The resulting graph shows a bell-like shape where the left half of the graph is a mirror image of the right half.

Question: Based on this context, diagnose the type of distribution observed by the researcher and explain what this visual pattern demonstrates about the spread of sleep hours around the center of the dataset.

Sample answer: The researcher has observed a symmetrical distribution. This bell-like shape with mirror-image halves demonstrates that the students' sleep hours are spread evenly on either side of the center of the distribution.

Key points:

  • Diagnose the sleep hours graph as representing a symmetrical distribution.
  • Acknowledge that the left and right halves of the graph are mirror images.
  • Explain that the students' scores are spread evenly on either side of the center.

Rubric: The student should correctly identify the distribution as a symmetrical distribution and explain that this means the sleep hours are spread evenly on both sides of the center.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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