The Department of Health and Human Services (HHS) wants to compare average per capita health care costs for four cities that have health maintenance organizations (HMOs) with four similar cities that do not have HMOs. Using the accompanying data, run a regression, and prepare a brief memo to HHS about the findings.

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HMO Cities $4,120 $3,860 $3,700 $4,040 Non-HMO Cities $5,160 $2,500 $4,090 $4,600