Question: Residual Analysis and Diagnostics

a. After running a regression model, y = ?_? + ?_??x_? + ?_???x_? + ?_?? x_? + ??, the model adequacy should be checked by performing a residual analysis. Check whether the following results justify the basic error term assumptions or not. When you look at the plots, can you see any unusual observations? State the assumptions that you are checking explicitly and use ?=0.05.

Durbin-Watson statistic = 1.17113