Question: Ten industrial plants participated in administering a new safety program. The average weekly losses of worker hours due to accidents before and after administration of the program are given below:

Before administering the program: 45 73 46 124 33 57 83 34 26 17

After administering the program: 36 60 44 119 35 51 77 29 24 11

Use a 0.05 level of significance to test whether the safety program is effective. Assume that both populations under consideration are normally distributed.