A researcher gives a drug to eight patients to lower diastolic blood pressure; measures of diastolic blood pressure are taken at the beginning and at the end of the study. (a) Suppose the researcher works for the drug company. They decide to do a hypothesis test at 90% confidence. Why does the researcher settle on the 90% confidence level? (b) At a 90% confidence level, can the researcher claim that the blood pressure decreases the diastolic blood pressure? Assume the differences between before and after follow a normal distribution. Patient Before After 2 100 110 95 3 112 106 114 4 119 5 99 107 96 6 7 120 105 108 101 8 117 116