Short Answer

Suppose a researcher wants to convert a non-experimental factorial study that measures pre-existing mood and sexual risk-taking into a true experiment. Following the approach of MacDonald and Martineau (2002), describe a specific action the researcher must take to implement this change and explain how this change affects the study's conclusions.

Question: Suppose a researcher wants to convert a non-experimental factorial study that measures pre-existing mood and sexual risk-taking into a true experiment. Following the approach of MacDonald and Martineau (2002), describe a specific action the researcher must take to implement this change and explain how this change affects the study's conclusions.

Sample answer: The researcher must actively manipulate the participants' moods (for example, by exposing them to mood-inducing stimuli like happy or sad videos) rather than simply measuring their pre-existing moods. This active manipulation changes the study from non-experimental to experimental, allowing the researcher to draw stronger causal inferences about the relationship between mood and sexual risk-taking.

Key points:

  • Actively manipulate the independent variable (mood) instead of measuring pre-existing states.
  • Randomly assign participants to induced mood conditions.
  • Explain that this manipulation enables stronger causal inferences.

Rubric: The response must describe the action of actively manipulating mood (e.g., inducing mood rather than measuring pre-existing mood) and state that this allows for stronger causal inferences.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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