A Pew Research Center poll found that 426 of 1520 adult Americans had read an e-book in the past year. (a) Find a point estimate for the proportion of all adult Americans who have read an e-book in the past year. Use appropriate notation and round to three significant figures. (b) Construct a 99% confidence interval for the proportion of all adult Americans who have read an e-book in the past year. Indicate which procedure you used and interpret your answer.