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A survey of 30 emergency room patients and the average waiting time for treatment is found to be 174.3 minutes. Assume the waiting times for treatment are normally

distributed with a population standard deviation of 46.5 minutes. Construct a 99% confidence interval for the population mean waiting time for treatment.

What is the sample mean?
31.8
30
174.3
46.5

1 Answer

5 votes
174.3 should be the answer!
User Mattia Maestrini
by
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