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Math Help - sample size

  1. #1
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    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!
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  2. #2
    MHF Contributor matheagle's Avatar
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    I get {(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.
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