The Oregon Department of Health web site provides information on the cost-to-charge ratio (the percentage of billed charges that are actual costs to the hospital). The cost-to-charge ratios for both inpatient and outpatient care in 2002 for a sample of six hospitals in Oregon follow.
Is there evidence that the mean cost-to-charge ratio for Oregon hospitals is less for outpatient care than for inpatient care? Use a significance level of .05.