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Homework Help: Can someone help me with a Statistic problem?

  1. Nov 3, 2005 #1
    Consider a survey of n people asking whether they plan to use Route A or Route B, with an anticipated fraction p choosing Route A.

    If p = .30, plot the 95% confidence bounds and the expected value of X as a function of n, for n = 50 to n = 800.

    I have no idea where to start or how to work it out..can someone please guide me through the problem.:mad:
  2. jcsd
  3. Nov 3, 2005 #2


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    I have difficulty believing you have no idea! Have you been sleeping through class?

    Strictly speaking, this is a "binomial distribution" problem but with n= 50 to 800, I suspect you are intended to use the Normal distribution approximation.

    If p= 0.7, do you know what the mean (expected value) is for given n? Do you know how to find the standard deviation?
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