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並前往https://stats.stackexchange.com/questions/591632/proof-of-variance-of-sample-proportion

Proof of Variance of Sample Proportion - Cross Validated

Can someone help me understand the following for the variance of a sample proportion. S2=∑(yi−p)2N−1=∑y2i−2p∑yi+Np2N−1=NN−1p(1−p).

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