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Sample Size Calculator
Calculate the required sample size per group for a two-group comparison study.
Study Parameters
Effect Size (Cohen's d)
Small (0.2)
Medium (0.5)
Large (0.8)
Statistical Power (1 - β)
0.70 (70%)
0.80 (80%) — Standard
0.90 (90%)
0.95 (95%)
Significance Level (α)
0.01
0.05 — Standard
0.10
Calculate Sample Size