Case Study

Based on the principle of converging evidence and the trade-offs of research designs, explain why the team's experimental finding is not sufficient on its own, and identify what type of study they should conduct next to complement their current finding.

Case context: A psychology research team is investigating the theory that 'mindfulness practice reduces academic anxiety.' They conduct a controlled laboratory experiment where students are randomly assigned to either a meditation session or a control session. They find that the meditation group reports significantly lower physiological anxiety. While this study confirms a causal link, the team wants to establish converging evidence before presenting their theory to the scientific community.

Question: Based on the principle of converging evidence and the trade-offs of research designs, explain why the team's experimental finding is not sufficient on its own, and identify what type of study they should conduct next to complement their current finding.

Sample answer: The experimental finding alone is not sufficient because, while it has high internal validity to confirm causality, it lacks high external validity to confirm real-world relevance due to its controlled laboratory setting. To establish converging evidence, the researchers should conduct a correlational study in a real-world setting. This will verify the relationship's real-world relevance, complementing the experiment's causal findings and increasing confidence in the theory.

Key points:

  • The lab experiment has high internal validity but lacks external validity/real-world relevance.
  • A correlational study is needed next to confirm real-world relevance.
  • Combining the correlational study with the experiment creates converging evidence.
  • The combination increases confidence in the theory's validity.

Rubric: Response must explain the limitation of the experiment (high internal validity but lacks external validity/real-world relevance) and identify a correlational study as the necessary next step to provide external validity and establish converging evidence.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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