Exit polls are surveys of a small percentage of voters taken after they leave their voting place. Pollsters use these data to project the positions of all voters or segments of voters on a particular race or ballot measure. From Election Center 2008 on the Cable News Network Web site, we found an exit poll for the 2008 presidential election. The following data, based on that exit poll, cross-classifies a sample of 1189 voters by age group and presidential-candidate preference after leaving their voting place.
At the 1% significance level, do the data provide sufficient evidence to conclude that an association exists between age group and presidential-candidate preference among all voters in the 2008 election?
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