whole question as graph

[6 marks] Consider a random selection of 100 patients who undergo treatment for high blood pressure. Let Yu be the systolic blood pressure [in mmI-lg] of the E\" patient prior to treatment, let H2 be the systolic blood pressure {in mmHg] of the if"1 patient pest treatment. Assume that the differences in bleed pressure (post- minus pre-treatment} are independent and approximately normally distributed. The data are available in the le hp . tat. a. {4 marks) Construct a 95% condence interval for the mean effect of treatment, i.e.. the mean change in systolic blood pressure following treatment. b. {2 marks) Does your condence interval in a] require the lil's and the 1612's to be independent and approximately normally distributed? Explain