21.8 Children of illegal immigrants. An October 2011 CBS News Poll on illegal immigrants interviewed 1012 randomly selected American adults. Of those in the sample, 688 said that they "oppose allowing the children of illegal immigrants to attend state college at the lower tuition rate of state residents." Although the samples in national polls are not SRSs, they are similar enough that our method gives approximately correct confidence intervals. (a) Explain in words what the parameter p is in this setting. (b) Use the poll results to give a 95% confidence interval for p. (c) Write a short explanation of your findings in (b) for someone who knows no statistics.