A clinical trial is planned to compare an experimental medication designed to lower blood pressure to a placebo. Before starting the trial, a pilot study is conducted involving ten participants. The objective of the study is to asses how systolic blood pressure changes over time untreated. Systolic blood pressures are measured at baseline and again 4 weeks later. Compute a 95% for the difference in blood pressures over 4 weeks.
Baseline: 120 145 130 160 152 143 126 121 115 135
4 weeks: 122 142 135 158 155 140 130 120 124 130