You hurry to the local emergency department in hopes of immediate urgent care only to find yourself

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You hurry to the local emergency department in hopes of immediate urgent care only to find yourself waiting for what seems like hours.

The manager of a large emergency department believes that his new procedures have substantially reduced the wait time for the average urgent care patient. He initiates a study to evaluate the wait time. The records of 18 randomly selected patients seen since the new procedures have been in place are checked, and the time between entering the emergency department and being seen by urgent care personnel was observed. The mean wait time was 17.82 minutes with a standard deviation of 5.68 minutes. Estimate the mean wait time using a 99% confidence interval. Assume that wait times are normally distributed.

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