Assumption MLR$.1($Linear in Parameters$)$

Suppose you and a research partner are interested in studying the effect of height on salary. Your partner proposes using a simple OLS regression model to analyze the following population model:

wage $={}_0+{}_1^2$ educ $+{}_2^2$ exper $+{}_3^2$height$+u$

where

wage $=$ annual salary

educ $=$ years of formal education

exper $=$ years of work experience

height $=$ height, in inches

The proposed model is

The proposed model is