19. Refer to Problem 8.42 in Chapter 8.

a) Treat expectation of voting as the control variable, and construct the partial tables re- lating political party affiliation to present voting intention

b) Show how to combine the partial tables to obtain the bivariate table constructed in Problem 8.43.

c) From constructing conditional distributions in the parual tables in part (a). indicate whether sample evidence of statistical interaction seems to exist.