Setting Up a Test for the Difference of Two Population Means

AP Statistics· difficulty 4/5

The safer default for two-sample t is

A
$z procedure$
B
$Pooled (assume equal variances)$
C
$Always one-sample$
D
$Unpooled (Welch) — does not require equal variances$
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Explanation

Welch's t makes fewer assumptions and is widely default in software.

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