Question: Explain how to detect the nonlinear relationship between y and x such as a quadratic equation model. Explain what is the marginal effect of x

Explain how to detect the nonlinear relationship between y and x such as a quadratic equation model. Explain what is the marginal effect of x on y for the quadratic equation if the estimated model is: Y = 10 + 5 X + 2X2 + e.

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