4. You are studying problem solving performance using time as a measure. It is known in advance that people either solve these problems very quickly or take considerable time to do so. A control group of ten subjects spend the following amounts of time (in minutes) solving the problem set: 1, 15, 2, 5, 11, 16, 1, 2, 10, 4. You select a sample of ten subjects and provide them with training you believe will reduce their mean time for solving the problem set. The results (again in minutes) from these individuals is as follows: 0.5, 2, 3, 11,1, 15,14, 12, 7, 5. Can you conclude from these data that the training was successful at the 0.05 significance level? (20 Points)