In the US the North and South are quite different. Below is the joint probability distribution of political affiliation (R = Republican, I = Independent and D = Democrat) for a Northern city and a Southern city. (a) (b) R I D Southern 0.24 0.04 0.12 Northen 0.18 0.12 0.30 (a) What is the probability of selecting a Republican given that we sample from the Northern city? (b) Are political affiliation and region of residence statistically independent random variables? Explain.