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Construct the 99% confidence interval for the mean of costs

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.

$2.19