Turbo-Tax and Tax-Cut are two of the best-selling tax preparation software packages. Recently, a consumer group conducted a test to estimate the difference in the mean time it would take an individual to complete his or her federal income tax using these two products. To run the test, the group selected a random sample of 16 people. All 16 people used both software packages to complete their taxes. Half of the people were assigned Turbo-Tax first, followed by Tax-Cut. The other half used the products in the opposite order. The following values represent the time in minutes that it took to complete the returns:

Based on these sample data, construct and interpret a 95% confidence interval estimate for the difference between the two population means.