The waiting time (in minutes) for emergency room patients with non-life-threatening injuries was measured at four hospitals

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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?
The waiting time (in minutes) for emergency room patients with
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