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Thread: Finding a P-value

  1. #1

    Finding a P-value




    The questions:

    Use technology to find the P-value for a right-tailed test with n=26 and test statistic t=1.219

    Use technology to find the P-value for a two-tailed test with n=26 and test statistic t= -2.989


    I haven't a clue how to do these with my calculator. Can someone point me in the right direction?

    Thanks

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    Quote Originally Posted by bluehorseshoe33 View Post
    The questions:

    Use technology to find the P-value for a right-tailed test with n=26 and test statistic t=1.219

    Use technology to find the P-value for a two-tailed test with n=26 and test statistic t= -2.989


    I haven't a clue how to do these with my calculator. Can someone point me in the right direction?

    Thanks
    I'd suggest you use a software package such as Minitab - it's very good for such questions.

    For example, t=1.219 (above) the associated p-value is: p=0.116894.

    This took me all of about ten seconds

    If not, then I would recommend that you attempt to make such computations using Microsoft Excel.


    Note: when referring to the Student t-distribution we should refer to the associated degrees of freedom (df) rather than n.

    For example, t(df=26).

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    Hmmmm...

    The homework software gave me .1171 for the first one. Totally lost now.

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    Quote Originally Posted by bluehorseshoe33 View Post
    The homework software gave me .1171 for the first one. Totally lost now.
    Let me explain.

    You obtained p=0.1171 because your calculation was based on 25 degrees of freedom (df) as follows:

    df = N - 1 = 26 -1 = 25.

    As I said above, in the previous post, you need to specify what the degrees of freedom are - it's not always going to be N - 1 (it could be N - 2, for example).

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