How do I show my work step by step in the following quesiton?
The values listed below are the waiting times (in minutes) of customers at the Bank of Providence, where customers enter any one of three different lines that have formed at three teller windows. Construct a 95% confidence interval for the population standard deviation and interpret the results.
4.2 5.4 5.8 6.2 6.7 7.7 8.5 9.3 10.0