The following figures give the systolic blood pressure of 16 joggers before and after an 8 kilometer run. Use the sign test at the 0.05 level of significance to test the null hypothesis that jogging 8 kilometers increases the median systolic blood pressure by 8 points against the alternative that the increase in the median is less than 8points.

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Jogger Before After 164 158 149 160 155 164 138 163 159 165 145 150 161 132 158 163 160 172 147 167 169 173 147 156 164 133 161 155 146 154 159 170