Problem 2.19 (4 pts) Compute the arithmetic mean and median for the difference in systolic and diastolic blood pressure, respectively, taken in different positions (recumbent minus standing). Problem 2.20 (4 pts) Construct a box plot for the difference scores for each type of blood pressure. Hint: You should create two different boxplots. The first boxplot will plot the difference scores for SBP (recumbent minus standing). The second boxplot will plot the difference scores for DBP (recumbent minus standing)