In a study on the effectiveness of physical exercise in weight loss, a group of 16 persons engaged in a prescribed program of physical exercise for one month. The results (in lbs) are as follows.

Before: 209 178 169 212 180 192 158 180 170 153 183 165 201 170 243 144

After: 196 171 170 207 177 190 150 180 164 152 179 162 199 173 231 140

At .10 significance level, test whether the prescribed program of exercise is effective. Use the five-step hypothesis test. (Hypotheses, decision rule, calculate, decision, conclusion)