Download the file “gasConsumption_deliverytrucks.”
a) Construct a scatterplot matrix of gas, cargoweight, delivery, and miles and recall that the last three are the predictors. Do the predictors appear to be correlated?
b) Construct a regression model for gas consumption when delivery and miles are the predictors. Then build another regression model, but with cargoweight. How does R²_a compare with R²?