A simple random sample of size n equals 40 is drawn from apopulation. The sample...

A simple random sample of size n equals 40 is drawn from a population. The sample mean is found to be x overbar equals 121.3 and the sample standard deviation is found to be s equals 12.9. Construct a 99% confidence interval for the population mean.

Upper:

Lower:

Solutions

Expert Solution

t /2,df = 2.708

Margin of error = E = t/2,df * (s /√n)

= 2.708 * (12.9 / √ 40)

Margin of error = E = 5.5

The 99% confidence interval estimate of the population mean is,

- E < < + E

121.3 - 5.5 < < 121.3 + 5.5

115.8 < < 126.8

Lower: 115.8

Upper: 126.8

orchestra answered 1 year ago

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