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    Construct the 99% confidence interval for the mean of costs

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    Construct the confidence interval.

    Requires either the use of t distribution or the normal distribution.

    Hospital costs for accident victims who wore seatbelts. 20 randomly selected cases have a distribution that appears to be bell-shaped with a mean of $9004 and a standard deviation of $5629. Construct the 99% confidence interval for the mean of all such costs.

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