Note dependent X1, independent X2, X3, X4

Objective:

• Plot the independent variables X2, X3 X4 together in a single plot - what do you conclude in terms of relationship between them?
• Run a regression model output adjusted R² and any other metrics you want to mention.
• Write the expression of the estimated regression model and evaluate it.
• A good model should only contain significant independent variables.
• Create residual plots.