How to do this in R for these additional questions?

(b) (c) Add partisan affiliation to the model by estimating the following model for each of the two dependent variables (the tax and spending variables): Answer; = Bo + 6) Political knowledge; + Bi Republican; + ; where Republican; is 1 for people who self-identify with the Republican Party and O for everyone else.'! Explain your results. The effect of party may go beyond simply giving all Republicans a bump up or down in their answers. It could be that political knowledge interacts with being Republican such that knowledge has different effects on Republicans and non-Republicans. To test this, estimate a model that includes a dummy interaction term: Answer; = Bo + 6 Political knowledge; + B2Republican; + 63Political knowledge; x Republican; + ; Explain the results and compare/contrast to the initial bivariate results