題組內容

2. (10%) A doctor is studying whether walking leads to a reduction in systolic blood pressure (measured in mmHg). To answer the question, 9 volunteers began a one-week walking program. Their blood pressures were measured before and after the program and the data is as follows:

(2) \( (5\%) \) Construct a \( 95\% \) confidence interval for the reduction in systolic blood pressure.