9) When we regress vote on growth, the R2 that comes with Stata is 0.3475. When we regress vote on growth, person, and inflation, the R that comes with Stata is 0.3929. What can we conclude? (3 points) a) Multiple regression model is a better fit than the simple linear regression model, since R2 increases in the multiple regression model b) Simple regression model is a better fit than the multiple linear regression model, when we compare R2 c) We cannot compare R2 between simple and multiple regression models because R2 will always increase when we add more x variables, however irrelevant they are d) None of the above if R2=0.8, SST = 500 and N= 22. Use simple regression model. (5 - 10) is points) 9) When we regress vote on growth, the R2 that comes with Stata is 0.3475. When we regress vote on growth, person, and inflation, the R that comes with Stata is 0.3929. What can we conclude? (3 points) a) Multiple regression model is a better fit than the simple linear regression model, since R2 increases in the multiple regression model b) Simple regression model is a better fit than the multiple linear regression model, when we compare R2 c) We cannot compare R2 between simple and multiple regression models because R2 will always increase when we add more x variables, however irrelevant they are d) None of the above if R2=0.8, SST = 500 and N= 22. Use simple regression model. (5 - 10) is points)