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Math Help - Sample size

  1. #1
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    Sample size

    The monthly starting salaries of students who receive engineering degrees have a standard deviation of $600. What sample size should be selected so that there is 0.95 probability of estimating the mean monthly income within $150 or less
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  2. #2
    MHF Contributor matheagle's Avatar
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    solve for n in the equation

    z_{\alpha/2}\sigma/\sqrt{n}\le B

    with z_{\alpha/2}=1.96
    B=150
    and \sigma =600
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  3. #3
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    with
    B=150
    and

    N = 225

    Please let me know if this is correct
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  4. #4
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    the answer is 61. i jsut worked on the formula again
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