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Math Help - p values

  1. #1
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    p values

    can anyone tell me how to find the p values for a z-score of 1.38 using the formula
    _
    x - score
    variance/squareroot n
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  2. #2
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    Quote Originally Posted by purcey_36 View Post
    can anyone tell me how to find the p values for a z-score of 1.38 using the formula
    _
    x - score
    variance/squareroot n
    Pr(Z > 1.38) = 0.0838. Get it from technology (I used a TI-89) or from tables.
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  3. #3
    MHF Contributor matheagle's Avatar
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    That's correct if you have a greater than sign in the alternative hypothesis.
    This cannot be answered until I know H_a.
    It doesn't matter if we are testing a mean or a proportion, we need H_a.
    AND if H_a:\mu\ne 21, then the p-value is twice this 0.0838.
    Last edited by matheagle; May 7th 2009 at 04:20 PM.
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