Questions 1) For each statement below, evaluate whether it is true, false, or uncertain, and fully explain your answer. a) (4 points) In a multiple regression, when control variables are correlated with the unobserved error term, the OLS slope estimate on the variable of interest is always biased. b) (4 points) Suppose you estimate the parameters of the model y = BotB1X1 +B2x2 + u. Based on an F-test, you reject the null that B, = 0 and B2 = 0. The appropriate conclusion is that both B1 # 0 and B2 # 0. c) (4 points) If the variables x, and x2 are correlated with each other, the multiple regression of y on x, and x2 will always produce different slope estimates from separate simple regressions of y on x, and y on X2