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The administrators of two hospitals wished to compare the lengths of stay of patients admitted to their hospitals. Paired samples of patients (twelve from each

The administrators of two hospitals wished to compare the lengths of stay of patients admitted to their hospitals. Paired samples of patients (twelve from each hospital) were obtained from new admission records collected over the previous year. The

patients were matched on sex, age, diagnosis, and insurance coverage. Their lengths of stay, in days, were as follows:

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