Justifying a Claim About a Population Mean Based on a Confidence Interval

AP Statistics· difficulty 3/5

A 95% CI for mean reaction time of (240, 280) ms means

A
$Mean is exactly 260 ms$
B
$95% of subjects respond between 240-280 ms$
C
$Reaction times average 95% accurate$
D
$We are 95% confident mean reaction time is between 240 and 280 ms$
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Explanation

CI describes the parameter, not individual values.

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