Diagnose the methodological challenge in this scenario. Explain why the researcher's initial within-subjects design is inappropriate for this setting, and justify why a between-subjects design is the required alternative.
Case context: A health psychology researcher wants to study how reading different types of health brochures (focused on diet vs. exercise) affects people's immediate health intentions. The researcher plans to recruit participants from a local community clinic's waiting room while they wait for their appointments. The clinic's appointments are scheduled tightly, and patients are called in randomly. The researcher initially plans to have each patient read the diet brochure, answer a questionnaire, then read the exercise brochure, and answer another questionnaire.
Question: Diagnose the methodological challenge in this scenario. Explain why the researcher's initial within-subjects design is inappropriate for this setting, and justify why a between-subjects design is the required alternative.
Sample answer: The methodological challenge is the severe and unpredictable time constraint of the clinic waiting room setting. A within-subjects design is inappropriate because the researcher does not have enough time to test each patient across both brochure conditions before they are called for their appointment. A between-subjects design is the required alternative because assigning each participant to only a single brochure condition reduces the time commitment per patient, ensuring the study can be completed within the brief opportunistic window.
Key points:
- Diagnose the severe time constraints/unpredictable nature of the clinic waiting room.
- Explain that within-subjects is inappropriate because there is insufficient time to test each participant across all conditions.
- Justify between-subjects design as the solution because it assigns each person to only a single condition, minimizing participation time.
Rubric: Grading criteria: 1) Correctly diagnoses the waiting room's severe time constraint. 2) Explains that the within-subjects design is inappropriate because it requires testing participants in all conditions, which is unfeasible under these time limits. 3) Justifies the between-subjects design by explaining that testing participants in only a single condition solves the time-constraint issue.
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Research Methods in Psychology - 4th American Edition @ KPU
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