Posted by Stephanie on .
What is a 95% confidence interval for mue, the population mean time the postal service employees have spent with the postal service?
n=100
mean=7
S=2 years

Statistics 
PsyDAG,
Standard error of the mean (SE) = S/square root of n
95% confidence interval for μ = mean ± 2SE
I hope this helps. Thanks for asking.