Logston Enterprises operates a variety of businesses in and around the St. Paul, Minnesota, area. Recently, the company was notified by the law firm representing several female employees that a lawsuit was going to be filed claiming that males were given preferential treatment when it came to pay raises by the company.

The Logston human resources manager has requested that an estimate be made of the difference between mean percentage raises granted to males versus females. Sample data are contained in the file Logston Enterprises. She wants you to develop, and interpret, a 95% confidence interval estimate. She further states that the distribution of percentage raises can be assumed approximately normal, and she expects the population variances to be about equal.