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Cyrus John

How do you calculate a confidence interval for a mean?

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Shyra Mae Gomez
Best Answer

Use the formula: CI=xˉ±z(sn)\text{CI} = \bar{x} \pm z \left( \frac{s}{\sqrt{n}} \right)CI=xˉ±z(n​s​), where xˉ\bar{x}xˉ is the sample mean, zzz is the z-score for the desired confidence level, sss is the sample standard deviation, and nnn is the sample size.

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