11.38 Building a multiple linear regression model. Let’s now build a model to predict the life-satisfaction score, LSI.

  1. (a) Consider a simple linear regression using GINI as the explanatory variable. Run the regression and summarize the results. Be sure to check assumptions.

  2. (b) Now consider a model using GINI and LIFE. Run the multiple regression and summarize the results. Again be sure to check assumptions.

  3. (c) Now consider a model using GINI, LIFE, and DEMOCRACY. Run the multiple regression and summarize the results. Again be sure to check assumptions.

  4. (d) Now consider a model using all four explanatory variables. Again summarize the results and check assumptions.