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 upper confidence limit of the 95% confidence interval is O a. 95.68 O b. 94.43 O c. 96.79 O d. 98.07

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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 upper confidence limit of the 95% confidence
interval is
O a.
95.68
O b. 94.43
O c. 96.79
98.07
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 upper confidence limit of the 95% confidence interval is O a. 95.68 O b. 94.43 O c. 96.79 98.07
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