Suppose that the waiting times for patients at a local hospital are normally distributed with a 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 u. The width of the 95% confidence interval estimate is O A. 13.58 О В. 11.38 ос. 16.12 O D. 17.86

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Suppose that the waiting times for patients at a local hospital are normally distributed with a 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 u. The width of the 95%
confidence interval estimate is
O A. 13.58
О В. 11.38
С. 16.12
O D. 17.86
Transcribed Image Text:Suppose that the waiting times for patients at a local hospital are normally distributed with a 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 u. The width of the 95% confidence interval estimate is O A. 13.58 О В. 11.38 С. 16.12 O D. 17.86
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