c. What is to satisfy both (a) and (b)? 21. A nutritionist is investigating the effects of a rigorous walking program on systolic blood pressure (SBP) in patients with mild hypertension. Subjects who agree to participate have their systolic blood pressure measured at the start of the study and then after completing the 6-week walking program. The data are Subject Starting SBP Ending SBP 140 128 130 125 150 140 160 162 135 137 128 130 142 135 151 140 Based on the data, is there evidence that SBP is significantly reduced by the walking program? Run the appropriate test at the 5% level of significance. 22. A medical treatment is compared to a surgical treatment for gallstones