A sample of size n 80 is drawn from a normal population who

A sample of size n = 80 is drawn from a normal population whose standard deviation is sigma = 6.3. The sample mean is x = 42.32. Part 1 out of 2 Construct an 80% confidence interval for mu. Round the answer to two decimal places, if necessary. An 80% confidence interval for the mean is

Solution

n=80 mu = 42.32 and sigma =6.3

For 80% confidence interval

margin of error =