The sample mean for 28 test observtions is 00328 If the popu

The sample mean for 28 test observtions is 0.0328. If the population standard deviation is known to be 0.015, determine the upper and lower limits of a 95% confidence interval for the population mean and identify the corrct interval below:

1) .0264, .0264

2) .0270,.0386

3) .0249,.0407

4).0272,.0384

5).0255,.0401

Solution

95% CI is 4) .0272,.0384