The monthly starting salaries in thousands of dollars of 12 maintenance personnel at TCU are compared to those from SMU using the data in the table shown below. Develop and interpret a 95% confidence interval for the difference in mean starting salaries at TCU and SMU.
TCU SMU
15.6 13.7
16.8 13.6
18.5 15.2
16.5 11.2
15.5 11.6
14.8 15.2
18.8 12.5
19.5 13.5
17.5 13.9
16.5 18.2
14.5 14.5
18.7 11.2