Nine students were placed on a special diet. The results after 6 weeks were as follows: Student 1 2 3 4 5 6 7 8 9 Weight before diet 117 135 118 115 159 130 152 115 108 Weight after diet 112 128 115 118 150 126 146 112 105 Test at = 0.05 that the diet reduced their weights on the average no more than 3 pounds. Assume that weights are normally distributed.