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A random sample of 48 days taken at a large hospital shows that an average of 38 patients were treated in the emergency room (ER) per day. The standard deviation of the population is 4.

a. Find the 99% confidence interval of the mean number of ER patients treated each day at the hospital.

b. Find the 99% confidence interval of the mean number of ER patients treated each day if the standard deviation were 8 instead of 4.

 

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