Inference from Sample Statistics and Margin of Error

SAT Math· difficulty 5/5

Two surveys both estimate population mean. Survey A: CI = (45, 55). Survey B: CI = (47, 53). Which is more precise?

A
$Survey B (narrower interval)$
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B
$Both equally precise$
C
$Cannot be determined$
D
$Survey A$

Explanation

A narrower CI indicates more precision (less uncertainty about the true mean).

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