Based on the principles of single-subject research, explain how the aggregated group data might have obscured the true clinical effects of this therapy, and discuss what a focus on individual behavior would reveal.
Case context: A clinical psychologist is testing a new cognitive behavioral therapy program for anxiety. In a group study, the overall anxiety scores of the 30 participants show no statistically significant change on average from pre-treatment to post-treatment. The researchers are tempted to conclude that the therapy is ineffective.
Question: Based on the principles of single-subject research, explain how the aggregated group data might have obscured the true clinical effects of this therapy, and discuss what a focus on individual behavior would reveal.
Sample answer: The aggregated group data might have obscured the therapy's effects by averaging out opposing individual outcomes. For example, if the therapy significantly reduced anxiety for 15 participants but increased anxiety for the other 15, the overall group average would show no change, falsely suggesting the therapy has no effect. A single-subject approach focusing on individual behavior would reveal these hidden variations by isolating individual responses, allowing researchers to see exactly who benefited and who was harmed.
Key points:
- Aggregated group data averages out individual scores, potentially obscuring differences.
- An average of no change can occur if the therapy helps some individuals but worsens others.
- Focusing on individual behavior allows researchers to isolate and identify specific individual responses.
- Uncovering variations helps directly address the specific needs or responses of particular individuals.
Rubric: The answer should demonstrate comprehension of how aggregation hides individual differences. The student must explain that a zero average effect does not mean the treatment had no effect on any individual, but rather that positive and negative effects on different individuals may have cancelled out. They must state that a focus on individual behavior allows researchers to isolate individual responses and reveal these variations.
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Research Methods in Psychology - 4th American Edition @ KPU
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