Find the Confidence Interval Specified $\bar { x } = 595$

question 72

Multiple Choice

Find the confidence interval specified.
-A random sample of 110 light bulbs had a mean life of $\bar { x } = 595$ hours. Assume that $\sigma = 31$ hours. Construct a $90 \%$ confidence interval for the mean life, $\mu$ , of all light bulbs of this type.

• A)\(590.1\) to \(599.9\) hours
• B) \(587.4\) to \(602.6\) hours
• C) \(588.1\) to \(601.9\) hours
• D) \(589.2\) to \(600.8\) hours

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