A doctor wished to compare the effectiveness of two blood pressure medications. She conducted a small study in which independent samples of newly diagnosed hypertension patients were randomly assigned to either medication A or B. After six months, the patients' diastolic blood pressure readings (in mmHg) were as follows: Medication A (n = 9): 80, 84, 86, 86, 90, 91, 92, 92, 94 Medication B (n = 11): 81, 82, 84, 85, 92, 93, 93, 93, 97, 99, 100 Is there evidence of any difference between patients on medications A and B with respect to diastolic blood pressure at six months? a. Use a nonparametric test and the critical value method at level = .05 to answer this question. Remember to state the appropriate null and alternative hypotheses.