Sample Size Proportion 2 Independent Samples CalculatoradminApril 28, 2026Calculators Sample Size Proportion 2 Independent Samples Calculator Z-value (α/2): 1.96 (95%) 1.645 (90%) 1.28 (80%) Proportion in group 1 (p1): Proportion in group 2 (p2): Difference to detect (d): Power (1 – β): For more information, refer to these authoritative sources: CDC – Sample Size Calculator UCLA – One Sample Z-Test
