Analyze the psychologist's conclusion using the findings from Posternak and Miller's 2001 meta-analysis. What methodological flaw compromises her conclusion, and what alternative explanation must be considered?
Case context: A clinical psychologist conducts a one-group pretest-posttest study to evaluate a newly developed mindfulness intervention for depression. After six weeks, she measures the participants' symptoms and finds a reduction in depression scores. She publishes a paper concluding that her mindfulness intervention is highly effective at treating depression.
Question: Analyze the psychologist's conclusion using the findings from Posternak and Miller's 2001 meta-analysis. What methodological flaw compromises her conclusion, and what alternative explanation must be considered?
Sample answer: The psychologist's conclusion is compromised by the lack of a control group. According to Posternak and Miller (2001), depressed individuals in wait-list control conditions naturally show an average improvement of to without formal therapy due to spontaneous remission. Because the reported reduction falls squarely within this range of natural recovery, the improvement cannot be confidently attributed to the mindfulness intervention. The alternative explanation is that the participants simply experienced spontaneous remission over the six weeks.
Key points:
- Identifies the missing control group (one-group design flaw).
- Cites spontaneous remission or natural recovery as the alternative explanation.
- Compares the observed reduction to the expected to natural improvement found by Posternak and Miller.
- Concludes that the treatment effect cannot be isolated from natural recovery.
Rubric: The response correctly identifies the absence of a control group as the methodological flaw and uses Posternak and Miller's to spontaneous remission rate as the alternative explanation for the observed improvement.
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