Astaff member at uf's wellness center is interested in seeing if a new stress reduction program will lower employees systolic blood pressure levels. twenty people are selected and have their blood pressure measured. each person then participates in the stress reduction program. one month after the stress reduction program, the systolic blood pressure levels of the employees were measured again. did the program reduce the average systolic blood pressure level? note: differences were taken by taking "before systolic blood pressure" minus "after blood pressure" the 95% confidence interval was (5.6, 10.2.