Question: Be sure to determine correctly whether the confidence intervals are calculated with the normal distribution or the t distribution. In a study relating the amounts

Be sure to determine correctly whether the confidence intervals are calculated with the normal or the t a study relating the amounts of time required for room-service delivery at a newly opened Radisson Hotel, 20 deliveries had a mean time of 24.2 min and a standard deviation of 8.7 min. The sample data appear to have a bell-shaped Construct the 90% confidence interval for the mean time of all deliveries.

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