### Confidence interval for the population mean

A corporation that maintains a large fleet of company cars for the use of its sales staff is interested in the mean distance driven monthly per sales person. The following table gives the monthly distances in miles driven by a random sample of 20 sales persons 2314, 2102, 1999, 1951, 2602, 2468, 1881, 2381, 2230, 1966, 2246, 26