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 p.m. 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?

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Emergency Room Waiting Time (minutes) Hospital A (5 patients) Hospital B (4 patients) Hospital C (7 patients) Hospital LD (6 patients) 10 19 25 17 36 20 9 24 16 18 29 15 26 10 12