Essay

Based on the provided text, describe the purpose of a manipulation check in an experiment that yields a null result, using the mood and memory study as an example. What are the two potential outcomes of this check?

Question: Based on the provided text, describe the purpose of a manipulation check in an experiment that yields a null result, using the mood and memory study as an example. What are the two potential outcomes of this check?

Sample answer: A manipulation check assesses whether the independent variable successfully altered the participants' actual state, helping to resolve uncertainty when a null result occurs. In the mood and memory example, if the check confirms the mood was successfully altered, the null result likely indicates that mood does not affect memory. However, if the check shows no mood change, it means the manipulation failed, and the true relationship between mood and memory remains unknown.

Key points:

  • A manipulation check assesses the participants' actual state (e.g., actual mood).
  • It helps resolve uncertainty when an experiment yields a null result.
  • If the manipulation check shows successful alteration, the null result indicates no relationship between variables.
  • If the manipulation check shows no change, the manipulation failed and the true relationship is unknown.

Rubric: Full credit is awarded if the student defines a manipulation check and correctly outlines the two possible outcomes (successful alteration vs. no change) and what they mean for interpreting a null result.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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