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5) After implementing a new strategy to improve services for patients, the Emergency Department of a...

5) After implementing a new strategy to improve services for patients, the Emergency Department of a hospital claims customers spend fewer than 23 minutes on average to see a physician. A randomly selected sample of 40 patients shows the average wait time of 22.6 minutes. Test the Emergency Department's claim at the 2.5% level of significance, assuming the standard deviation of wait time for all patients in that hospital is 4.15 minutes.

3) A major online retailer wishes to know the average number of returns processed at each of its return centers every week, accurate to within 125 returns. If the standard deviation is 600

Math   Statistics-And-Probability   
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