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In a random sample of 25 patients in the emergency room, the sample mean waiting time before being seen by a doctor was 28 minutes

In a random sample of 25 patients in the emergency room, the sample mean waiting time before being seen by a doctor was 28 minutes with a sample standard deviation of 6 minutes. Assume waiting times are approximately normal. Compute a 90% confidence interval for the mean waiting time for all patients to be seen by a doctor.

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