pls provide steps

A certain stimulus is to be tested for its effect on blood pressure. Twelve men have their blood pressure measured before and after the stimulus. The results are Man 2 3 4 5 6 8 9 10 11 12 Before (X) 120 124 130 118 140 128 140 135 126 130 126 127 After (1) 128 131 131 127 132 125 141 137 118 132 129 135 In this particular scenario, we define W = Y - X as the improvement or increase in blood pressure due to the stimulus and assume that Wi's (1 - 1,2, ...,12) are independent and distributed according to a n(Hw, ow ) distribution. Let F (X) = /4x and B (Y) = Hy. Construct a 95% confidence interval for ly - /x, the average effect of the stimulus on blood pressure. Do you think the stimulus does have an effect on the blood pressure based on this 95% confidence interval? Briefly explain your answer. Note that W -n ( Hw. i ) (b) Construct an equal tailed 95% confidence interval for ow. Hint: Use (n-1)SW ~ X7-1. ow (n = 1)5w