The U.S. Department of Human Services research team has submitted a report to you on the infant mortality rate. The team uses a regression equation in which infant mortality (the number of infants who die per 1,000 live births) is a function of the year (X₁, where 1960 = 1), Medicaid expenditures (X₂, in millions of dollars), and the expenditures on Women, Infants, and Children (WIC) supplemental food programs (X₃, also in millions of dollars). Interpret the following regression. Th en predict the infant mortality rate for 2012 if $4,536 million is spent on Medicaid and $774 million is spent on WIC. Which of the variables is the most important predictor? If you had $1 million to spend, what would be the most effective use of that money?

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Ŷ 28.32.239X₁ = .239X₁.001476X₂ - .003266X3 = .00137 Sylx = .32 R² = .99 Adj. R² = .98 561 = .029 56₂ = .000143 563