- The distribution of the time the population of employees have worked for the postal service is approximately
Normal. A recent study found that the average time postal employees had worked for the postal service was
6.9 years with population standard deviation of 2.1 years. Suppose a random sample of 30 employees was
taken and the average for the sample was -7.3.
ACreate a 95% confidence interval for the mean time u the population of postal service employees have
spent
with the postal service.
BInterpret your 95% confidence interval from part a.
CDoes the population mean fall inside the interval? Interpret what this means.
