Confidence Intervals (Part III)

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5 Terms

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Confidence Interval Width

The total distance across the confidence interval, representing how precisely the mean is estimated.

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precise estimate

A smaller width means a more….

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X̄ ± W

Way of writing the Confidence interval where the W is the half-width (the margin of error)

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target W

Researchers often plan studies to achieve a ________, such as ±0.5 units around the mean.

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n = ((t_(m-1,α/2))^2(s^2))/(W^2)

Formula for planning sample size for a desired Confidence Interval Width case (t-case)

The s in this formula represents the sample standard deviation from the preliminary sample