Independent Samples Z-Test - Comparing Two Proportions (Pooled)

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Where g1 and g2 are the two proportions and n1 and n2 are the sample sizes:

z=g1−g2deff×g12(1−g12)(n1−1+n2−1)

where:

g12=n1g1+n2g2n1+n2, and
p=2(1−Φ(|z|)).