
sample size
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 with 95% confidence the maximum error of the estimate of p is 0.04 when the size of the student body is:
a. N=1500?
b. N=15,000?
c. N=25,000?
Thank you for looking and for any help you can give me!

I get $\displaystyle {(1.96)^2pq\over (.04)^2}$
where the max of pq is (.5)(.5)=.25 giving none of your answers.
See the bottom of http://www.ltcconline.net/greenl/Cou...ion/ciprop.htm,
where there should be inequalities and not equalities with n.
Oh, these are three different questions?
I would say 601 no matter how big the population is.