Sampling Distributions for Differences in Sample Means

AP Statistics· difficulty 4/5

For independent samples, SE(x̄₁ - x̄₂) =

A
$s₁ + s₂$
B
$(s₁ + s₂)/\sqrtn$
C
$s₁/n₁ + s₂/n₂$
D
$\sqrt(s₁²/n₁ + s₂²/n₂)$
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Explanation

Variances add; take square root.

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