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Calculate and interpret effect sizes for statistical significance. Common effect sizes: 1. Cohen's d for t-tests: (M1-M2)/pooled SD. Small=0.2, medium=0.5, large=0.8. 2. Eta squared (η²) for ANOVA: SS_effect/SS_total. Small=0.01, medium=0.06, large=0.14. 3. Pearson's r for correlations: Small=0.10, ...
