Two-proportion z-interval: CI for p1 minus p2: (p-hat1 minus p-hat2) plus or minus z-star times SE, where SE = sqrt(p-hat1(1-p-hat1)/n1 + p-hat2(1-p-hat2)/n2).
How to apply it: Use this interval to estimate the difference between two population proportions.
Course: AP Statistics · Unit: Inference for Categorical Data: Proportions
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