A sample of 400 items is taken from a population whose standard deviation is

Question

10. The mean of the sample is 40. Compute whether the sample has come from a
population with mean 38. Also calculate 95% confidence interval for mean of the
population

Answer 1

A sample of 400 items is taken from a population whose standard deviation is
10. The mean of the sample is 40. Compute whether the sample has come from a
population with mean 38. Also calculate 95% confidence interval for mean of the
population