Suppose the following estimated equation. Standard errors are in parentheses. Y = $633.25 + 0.148%] + 11.13X2 + 3.2GX3 n = 400 R2 = 0.465 {112.23} (0.017) {4.38) [1.45) You are to test if the variable of X3 shows a significant positive impact on the model. Answer the followings. a. State the hypotheses. to. What is the p-value? 0. Should the variable of X3 be included in the model? Explain