Exercise 2 Several years ago, ballots in Champaign-Urbana contained the following question to assess public opinion on an issue: \"Should the State of Illinois legalize and regulate the sale and use of marijuana in a similar fashion as the State of Colorado?\" Suppose we obtain a random sample of 80 Champaign voters, of which 55 support marijuana legalization. We also obtain a random sample of 100 Urbana voters, of which 75 support marijuana legalization. Let pc be the true proportion of Champaign voters who support marijuana legalization, and let pu be the true proportion of Urbana voters who support marijuana legalization. (a) Calculate a 95% confidence interval for pu - pc. (b) Calculate the p-value for the test Ho: pu = pc versus H1: pu # pc. Using a level of significance of a= 0.05, make a decision about the null hypothesis and provide a concluding statement in the context of this situation