Two Proportion Z-Test Calculator
Test if two population proportions are significantly different
About Two Proportion Z-Test
Formula: z = (p̂₁ - p̂₂) / √(p̂(1-p̂)(1/n₁ + 1/n₂))
Assumptions:
- Independent random samples
- n₁p̂₁, n₁(1-p̂₁), n₂p̂₂, n₂(1-p̂₂) all ≥ 5