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Math Help - Sampling Question

  1. #1
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    May 2008
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    Sampling Question

    Got an exam tomorrow, have no idea how to do this question from a past exam
    sorry for not using latex, i haven't used this forum in a while and don't remember how.

    An Investigation is conducted to determine whether the proportion of cracked tiles in a building exceeds a certain percentage. How many tiles must be sampled to estimate the true proportion of cracked tiles to within +-1% at the 99% level of confidence
    A. 3383
    B. 4147
    C. 13530
    D. 16588
    E. 22636

    A forumla given on the formula sheet that I'm not sure is applicable is
    n>=(2*Z(alpha/2) sigma)/d)^2
    alpha /2 is subscript

    Also if the formula is not related what is the formula for?
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  2. #2
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    May 2008
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    PEOD6/PD006: Determining Sample Size
    worked out the sample size using that website
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