Suppose that the walting 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 a. The width of the 95% confidence interval estimate is Oa 11.38 b. 13.58

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ness Statistics 1 || Spring21
Time left 1:26:29
Suppose that the walting 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 a. The width of the 95% confidence interval estimate is
Oa 11.38
Ob. 13.58
Oc 16.12
Od. 17.86
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Transcribed Image Text:ness Statistics 1 || Spring21 Time left 1:26:29 Suppose that the walting 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 a. The width of the 95% confidence interval estimate is Oa 11.38 Ob. 13.58 Oc 16.12 Od. 17.86 PAGE NEXT PAGE MAY étv 23
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