Independent Complex Samples Z-Test - Comparing Two Proportions

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Where g_1 and g_2 are the two proportions and \sigma_{g_1} and \sigma_{g_2} are their standard errors:

z=\frac{g_1-g_2}{\sqrt{\sigma^2_{g_1} + \sigma^2_{g_1}}},

where p = 2(1-\Phi(|z|)).

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