A company has a fleet of 322 automobiles. A random sample of 35 of the cars finds

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A company has a fleet of 322 automobiles. A random sample of 35 of the cars finds that the sample standard deviation of annual repair costs is $272. Company planners want to construct, for the overall mean of annual repair costs, a 90 % confidence interval that extends $100 on either side of the sample mean.

How many additional sample observations must they take?

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Statistics For Business And Financial Economics

ISBN: 9781461458975

3rd Edition

Authors: Cheng Few Lee , John C Lee , Alice C Lee

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