The waiting time (in minutes) for emergency room patients with non-life-threatening injuries was measured at four hospitals for all patients who arrived between 6:00 and 6:30 PM on a certain Wednesday. The results are shown below. Research question: Are the mean waiting times the same for emergency patients in these four hospitals? Use 0.05 for the significance level in making your decision.
The emergency room waiting times in minutes are:
Hospital A (5 patients): 10, 19, 5, 26, 11
Hospital B (4 patients): 8, 25, 17, 36
Hospital C (7 patients): 5, 11, 24, 16, 18, 29, 15
Hospital D (6 patients): 0, 20, 9, 5, 10, 12