Use the Confidence Level and Sample Data to Find a Confidence

question 107

Multiple Choice

Use the confidence level and sample data to find a confidence interval for estimating the population µ.
-A random sample of 79 light bulbs had a mean life of $x = 400$ hours with a standard deviation of $\sigma = 28$ hours. Construct a 90 percent confidence interval for the mean life, $\mu$ , of all light bulbs of this type.

• A) \(393 < \mu < 407\)
• B) \(394 < \mu < 406\)
• C) \(395 < \mu < 405\)
• D) \(392 < \mu < 408\)

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