Construct a 99% confidthence interval for the population mean .Assume the population has a normal distribution. A group of 19 randomly selected employees has a mean age of 22.4 years with a standard...

Construct a 99% confidthence interval for the population mean .Assume the population has a normal distribution. A group of 19 randomly selected employees has a mean age of 22.4 years with a standard deviation of 3.8 years. Round to the nearest tenth.

A] Determine the critical value ta/2 with n-the 1 degrees of freedom

B] Determine the lower and upper bound of the confidence interval

C] Interpret the confidence interval.