Two Proportion Z-Test Calculator

Test if two population proportions are significantly different

Group 1 Successes (x₁):

Group 1 Size (n₁):

Group 2 Successes (x₂):

Group 2 Size (n₂):

Alternative Hypothesis:

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

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