Consider the following simple regression model: y = β0 + β1×1
2+ u

Consider the following simple regression model: y = β0 + β1×1
2+ u
(1). Which of the following statements is correct?
The effect of x1 on y, is measured by β1
.
The effect of x1 on y, is measured by β0 + 2β1×1

All of the a