Sampling Distributions for Differences in Sample Proportions

AP Statistics· difficulty 4/5

SD of p̂₁ - p̂₂ for independent samples is

A
$Cannot be computed$
B
$p₁(1-p₁) + p₂(1-p₂)$
C
$\sqrt(p₁(1-p₁)/n₁ + p₂(1-p₂)/n₂)$
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D
$(p₁ - p₂)/\sqrtn$

Explanation

Variances of p̂s add; SD is the square root.

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