I need help with the full explanation and answer

5. 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 95% confident that the estimated percentage is in error by no more than three 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 78% of women give birth