19. Approval 2011 In November 2011, Barack Obama's approval rating stood at 45% in Rasmussen's daily track- ing poll of 1500 randomly surveyed U.S. adults. a) Make a 95% confidence interval for his approval rating by all U.S. adults. b) Based on the confidence interval, test the null hypoth- esis that Obama's approval rating was no worse than his November 2009 approval rating of 50%.

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