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Consider a multiple regression equation predicting life expectancy in a random sample of 35 countries. X1 is per capita GDP and X2 is country's homicide

Consider a multiple regression equation predicting life expectancy in a random sample of 35 countries. X1 is per capita GDP and X2 is country's homicide rate (per 100,000). Suppose the regression equation is Y = a + .5(X1) .08(X2). How should we interpret a?

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