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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

Question 21

Multiple Choice

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Suppose that the waiting times for patients at a local hospital are normally distributed with known population standard deviation of 30 minutes.A random sample of 75 patients in the local hospital had a mean time of 90 minutes.Assume a 95% confidence interval for the population mean μ.
-Calculate the width of the 95% confidence interval estimate.


A) 16.12
B) 11.38
C) 17.86
D) 13.58

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