Question: Approval 2007. In May 2007, George W. Bush s approval rating stood at 30% according to a CBS News/New York Times national survey of 1125 randomly selected 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 hypothesis that Bush's approval rating was no better than the 27% level established by Richard Nixon during the Watergate scandal.