Two Proportion Z-Test Calculator

A two proportion z-test is used to test for a difference between two population proportions. The test statistic is calculated as:

z = (p₁-p₂) / √(p(1-p)(1/n₁+1/n₂)

where:

• p = total pooled proportion
• p₁ = sample 1 proportion
• p₂ = sample 2 proportion
• n₁ = sample 1 size
• n₂ = sample 2 size

To perform a two proportion z-test, simply fill in the information below and then click the “Calculate” button.

p₁ (sample 1 proportion)

n₁ (sample 1 size)

p₂ (sample 2 proportion)

n₂ (sample 2 size)

z-statistic: 0.31917

p-value (one-tailed): 0.37480

p-value (two-tailed): 0.74960