An epidemiologist plans to conduct a survey to estimate the percentage of women who give birth. How many women must be surveyed in order to be 99% confident that the estimated percentage is in error by no more than two percentage points?
a. Assume that nothing is known about the percentage to be estimated.
b. Assume that a prior study conducted by the U.S. Census Bureau showed that 82% of women give birth.
c. What is wrong with surveying randomly selected adult women?