You are interested in the causal effect of a variable X on an outcome Y. You regress Y on X and get the following regression result: Y=4.38.1X. A colleague criticizes the lack of flexibility of your functional form choice, and insists you add X2,X3,X4, and X5 in your regression equation. While such additions may be warranted, which of the following are primary reasons why adding these additional powers of X could be problematic? Instructions: In order to receive full credit, you must make a selection for each option. For correct answer(s), click the box once to place a check mark. For incorrect answer(s), click the option twice to empty the box. You cannot add all these terms into the model at once. They may reduce the precision of your estimates. They will complicate the exposition. They will likely cause an endogeneity