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A sample of size 60 was selected from a population with a variance = 12. It...

A sample of size 60 was selected from a population with a variance = 12. It was found, based upon the data obtained, that the sample mean = 174. What is the 99% confidence interval estimate for the population mean?

174 ± 0.392

174 ± 3.04

174 ± 0.515

174 ± 3.99

174 ± 12

Math   Statistics-And-Probability   
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Answer #1

Note: I think there is a typo in the question, A sample of size 60 was selected from a population with a standard deviation = 12

Z for 99% confidence interval = Z0.005 = 2.575

Confidence interval

                               

                                = (174 + 3.99)

Option-D) 174 ± 3.99

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