3. Suppose a study is undertaken to compare voter preference (Democrat=0 or Republican=1) for samples from three different regions (Urban=0, Suburban=1, and Rural=2) in a certain state. Additional adjustment variables that were collected include age (years), gender (coded male=0, female=1), race (Caucasian=0, African-American=1, Asian=2, Other=3), and household income (thousands of dollars). Let u =p=P(Y = 1) =P(vote Republican) and the base group be Urban. Say the following model is fit: log 1 - = Bo + 31/suburban + 32Rural + B3Age