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    captainminhas Posts: 2, Reputation: 1
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    Feb 15, 2011, 04:55 PM
    90% confidence interval
    An office manager wishes to estimate the mean time required to handle a customer complaint. A sample of 38 complaints shows a mean of 28.7 min and standard deviation of 12 min. construct a 90% confidence interval estimate for true mean time required to handle customer complaints.

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