A test was conducted for two overnight mail delivery services. Two samples of identical deliveries were set up so that both delivery services were notified of the need for a delivery at the same time. The hours required to make each delivery follow. Do the data shown suggest a difference in the median delivery times for the two services? Use a .10 level of significance.
Service Delivery 1 2
1 24.5 28.0
2 26.0 25.5
3 28.0 32.0
4 21.0 20.0
5 18.0 19.5
6 36.0 28.0
7 25.0 29.0
8 21.0 22.0
9 24.0 23.5
10 26.0 29.5
11 31.0 30.0