Let p equal the proportion of college students who favor a new policy for alcohol consumption on

Question:

Let p equal the proportion of college students who favor a new policy for alcohol consumption on campus. How large a sample is required to estimate p so that the maximum error of the estimate of p is 0.04 with 95% confidence when the size of the student body is
(a) N = 1500?
(b) N = 15,000?
(c) N = 25,000?