Download the file “Sustainability__2010-2013_Baltimore”; which has Baltimore data. We will model clogged13 (2013 rate of clogged storm drain reports per 1000 residents) considering clogged12, clogged11, dirtyst13 (rate of dirty streets and alleys reports per 1000 residents), and carpool13 (2013 percent of population that carpool to work) as predictors.

a) Construct a scatterplot matrix of all the variables. Do the predictors appear to be correlated? Are the findings expected?

b) According to t-tests, are any predictors statistically insignificant?Use α = 10%.
c) Construct a regression model for clogged13 using clogged12 and dirtyst13. Then build another regression model, but adding carpool13. Compare R² and R²_a from both models.