Short Answer

A researcher studying mood disorders plots a dataset of Beck Depression Inventory scores and identifies a bimodal distribution. How should they apply this graphical pattern to describe the structure of their dataset, and what does it suggest about their participants?

Question: A researcher studying mood disorders plots a dataset of Beck Depression Inventory scores and identifies a bimodal distribution. How should they apply this graphical pattern to describe the structure of their dataset, and what does it suggest about their participants?

Sample answer: They should identify a pattern of two distinct peaks in the distribution. This pattern suggests that their participants are divided into two divergent subpopulations.

Key points:

  • Apply the concept of bimodal distribution to expect two distinct peaks.
  • Conclude that the sample contains divergent subpopulations.
  • Relate the pattern to scores on the Beck Depression Inventory.

Rubric: The response must mention the two distinct peaks characterizing the distribution and explain that it suggests the participants belong to divergent subpopulations.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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