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    Construct a 98% confidence interval

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    The mean life time of a random sample of 12 microwave ovens is 8.6 years with a standard deviation of 2.7 years.

    If possible, construct the 98% confidence interval for the population standard deviation. The distribution of life time of microwave ovens is known to be skewed left.

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    The solution assists with constructing a 98% confidence interval.

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