"Baseline: 120 145 130 160 152 143 126 121 115 135

4 Weeks: 122 142 135 158 155 140 130 120 124 130"

"The main trial for the medication in Problem 2 is conducted and involves a total of 200 patients. Patients are enrolled and randomized to receive either the experimental medication or the placebo. The data shown in Table 623 are data collected at the end of the study after 6 weeks on the assigned treatment.

a. Generate a 95% CI for the difference in mean systolic blood pressures between groups."