Rework Exercise 16.7 by using the signed-rank test,
In Exercise 16.7
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 8 points.

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