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Case Study

Analyze how Sarah's study design aligns with the formal definition of psychology. In your analysis, identify how the specific variables she measures correspond to the core components of the definition, and explain why her approach is considered scientific compared to relying on common sense.

Case context: A student researcher, Sarah, is investigating the popular belief that 'venting anger by hitting a soft object makes people feel calmer.' To study this, she designs an experiment where participants are insulted to induce anger. She then measures their heart rate (physiological mechanism), asks them to rate their internal feelings of anger on a scale (cognitive/mental process), and counts how many times they choose to blast an opponent with loud noise in a subsequent task (behavior). She plans to use this collected data to evaluate the common-sense claim.

Question: Analyze how Sarah's study design aligns with the formal definition of psychology. In your analysis, identify how the specific variables she measures correspond to the core components of the definition, and explain why her approach is considered scientific compared to relying on common sense.

Sample answer: Sarah's study aligns with the formal definition of psychology because she investigates both observable behavior (noise-blasting actions) and mental processes (insult-induced anger feelings), including physiological mechanisms (heart rate). Furthermore, rather than accepting the common-sense belief that venting works, she uses systematic measurements to collect empirical evidence, satisfying the definition of psychology as a scientific discipline.

Key points:

  • Explain how the noise-blasting variable measures observable behavior.
  • Link the heart rate and anger scale ratings to physiological and mental processes.
  • Contrast Sarah's empirical data collection with reliance on common-sense assumptions.

Rubric: Award 1 point for explaining how noise-blasting represents observable behavior ('how individuals act'). Award 1 point for connecting heart rate and anger ratings to mental processes ('think' and 'feel') or physiological/cognitive mechanisms. Award 1 point for explaining that collecting systematic data represents relying on empirical evidence rather than common sense.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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