Data Collectionhard
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A researcher compares two reading interventions (A and B) using a crossover design: 35 struggling readers each receive both interventions in random order, with a 2-week washout between. Outcome: reading fluency gain (words per minute).
Correlation between a student's gain under Intervention A and their gain under Intervention B: .
Compared to a between-subjects design (70 independent students, 35 per intervention), approximately how much more power does the crossover design provide?
A researcher compares two reading interventions (A and B) using a crossover design: 35 struggling readers each receive both interventions in random order, with a 2-week washout between. Outcome: reading fluency gain (words per minute).
Correlation between a student's gain under Intervention A and their gain under Intervention B: .
Compared to a between-subjects design (70 independent students, 35 per intervention), approximately how much more power does the crossover design provide?