2. Specify the same propensity score model as you did in Problem 1, but add other covariates of your choice to your model. (a) Details about the model (covariates selected, type of match type used) (b) Details about covariance balance between the treated group and matched controls (e.g., percent bias, differences in means, t-test results) (c) Visualization of the region of common support (d) Your findings regarding the estimated treatment effect (e) Describe how the revised model compares to the one you ran in 1. How did the additional covariates affect the level of bias? Does the revised model change your overall conclusions on the effectiveness of the prison program?