Building a multiple linear regression model. Let's now build a model to predict the life satisfaction score, LSI.
(a) Consider a simple linear regression using GINI as the explanatory variable. Run the regression and summarize the results. Be sure to check assumptions.
(b) Now consider a model using GINI and LIFE. Run the multiple regression and summarize the results. Again be sure to check assumptions
(c) Now consider a model using GINI, LIFE, and DEMOCRACY. Run the multiple regression and summarize the results. Again be sure to check assumptions.
(d) Now consider a model using all four explanatory variables. Again summarize the results and check assumptions.