OpenStax, Introductory Business Statistics 2e §8.2 A Confidence Interval When the Population Standard Deviation Is Unknown and Small Sample Case · Example 1 · Statistics · Confidence intervals

A Confidence Interval When the Population Standard Deviation Is Unknown and Small Sample Case · Example 1

The average earnings per share (EPS) for 10 industrial stocks randomly selected from those listed on the Dow-Jones Industrial Average was found to be $\overset{ˉ}{X}$ = 1.85 with a standard deviation of s=0.395. Calculate a 99% confidence interval for the average EPS of all the industrials listed on the DJIA.
$\overset{x}{ˉ} - t_{v, α} (\frac{s}{n}) \leq μ \leq \overset{x}{ˉ} + t_{v, α} (\frac{s}{n})$

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OpenStax, Introductory Business Statistics 2e · §8.2 A Confidence Interval When the Population Standard Deviation Is Unknown and Small Sample Case · Example 1

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