Using your comprehension of Birnbaum's (1999) study on the lack of context in between-subjects designs, diagnose why the researcher obtained this paradoxical result. Describe the internal reference frames that the participants in Group A and Group B likely used to make their judgments, and explain how the choice of design created this issue.
Case context: A researcher is conducting a study on the subjective severity of symptoms associated with different illnesses. Group A is asked to rate the severity of 'having a mild cold' on a 1-to-10 scale. Group B is asked to rate the severity of 'having clinical pneumonia' on the same scale. The researcher finds that Group A's average rating for 'having a mild cold' is 7.2, whereas Group B's average rating for 'having clinical pneumonia' is 5.4. The researcher is puzzled by this paradoxical result.
Question: Using your comprehension of Birnbaum's (1999) study on the lack of context in between-subjects designs, diagnose why the researcher obtained this paradoxical result. Describe the internal reference frames that the participants in Group A and Group B likely used to make their judgments, and explain how the choice of design created this issue.
Sample answer: The researcher obtained this result due to a lack of context inherent in the between-subjects design. Because Group A and Group B rated their respective symptoms in isolation, participants lacked a direct baseline for comparison. Group A likely compared 'having a mild cold' to minor everyday inconveniences (e.g., allergies or a scratchy throat), leading them to rate it relatively high on their scale. In contrast, Group B likely compared 'having clinical pneumonia' to life-threatening medical emergencies (e.g., heart attacks or organ failure), leading them to rate it relatively low. The between-subjects design forced participants to create separate, subjective internal contexts, causing the minor symptom to be rated higher than the severe one.
Key points:
- The paradoxical results are caused by a lack of context in the between-subjects design.
- Group A participants compared their symptom to minor health issues, skewing their rating higher.
- Group B participants compared their symptom to major or fatal health crises, skewing their rating lower.
- Without a direct comparison group, participants default to unequal internal scales.
Rubric: Grading Rubric: - Connects the puzzle to the 'lack of context' problem in between-subjects designs. - Explains the likely internal reference frame for Group A (mild cold vs. minor illnesses). - Explains the likely internal reference frame for Group B (pneumonia vs. severe/fatal illnesses). - Explains that the between-subjects design caused these separate, subjective comparisons.
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Research Methods in Psychology - 4th American Edition @ KPU
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