Statistics > Mean, Standard Deviation, and the Shape of the Sampling Distribution of the Sample Proportion
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The mean of the sampling distribution of the sample proportion,
,
is the population proportion, p.
The standard deviation of the sampling distribution of the sample proportion is
√p(1
− p) ⁄ n.
If np > 5 and n(1
− p) > 5, then the sampling distribution of
is approximately normal.

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