1) A researcher at a major clinic wishes to estimate the proportion of the adult population of the United States that has sleep deprivation. How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 5%?
Express the confidence interval using the indicated format.
2) Express the confidence interval 0.148 < p < 0.652 in the form of p ± E.
3) Express the confidence interval 0.469 ± 0.077 in the form of p - E < p < p + E.