In the standard regression formula of Y_i = β₀ + β₁X_i + U_i, which object is most closely tied to the marginal effect of X on Y? A) β₀ B) Y_i C) β₁ D) U_i

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The coefficient term β₁ measures the change in Y for a one-unit change in X, and is therefore most closely tied to the marginal effect of X on Y. Choice A represents the intercept term, Choice B represents the dependent variable term, and Choice D represents the error term, none of which are directly tied to the marginal effect of X on Y.

In the Standard Regression Formula of Yi = β0

In the Standard Regression Formula of Y_i = β₀