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Thread: Need help with statistics- a high test statistic and p-value.

  1. #1

    Default Need help with statistics- a high test statistic and p-value.

    In some reason this is not covered in my statistics textbook, and I found misleading information online.

    If here is somebody, who knows his stuff, please help me.

    I have a test statistic of z=4.95

    P-value: P(Z > z) = P(Z > 4.95) = 1 P(Z < 4.95)

    The problem is, the table runs out of values at 3.99, as you probably know. In this case, the p-value should be extremely small and significant, right?

    Then what got me confused - on this webpage, http://www.drbenniewaller.com/online...zes/quiz11.asp

    Question 10. What is the p-value if the computed test statistic is 4.1?
    A: 1.0
    B: 0.0
    C: 0.05
    D: 0.95

    I select B: 0.0, submit and it tells me this is wrong. I then select A:1.0, submit and it tells me this is right. What's going on here? How can 1 - 0.99999997 = 1? I think I have a pretty good understanding of test statistic, significance levels and hypothesis.. but I am asked to write 'what is the p-value', and with a test statistic 4.95, I don't know what to do..? I am confident I got the test statistic correct, it is not a difficult calculation.

    Thanks!
    True Neutral

  2. #2

    Default

    Are you doing a 1-tailed or 2-tailed test, and what significance level are you using?

  3. #3

    Default

    http://www.socscistatistics.com/pval...tribution.aspx

    Here's a link that might have helped
    The Difference Between the Ignorant and the Intelligent...
    The intelligent fully understand just how ignorant they are.
    The Arrogance of Ignorance is not Wisdom
    chartsrgood

  4. #4

    Default

    Thanks for the calculator! Pretty nifty.

  5. #5

    Default

    Quote Originally Posted by Brad Preston View Post
    Thanks for the calculator! Pretty nifty.
    Your welcome!
    (just saw the post)
    The Difference Between the Ignorant and the Intelligent...
    The intelligent fully understand just how ignorant they are.
    The Arrogance of Ignorance is not Wisdom
    chartsrgood

  6. #6

    Default

    I would like to try with the calculator. Will let you know about the feedback how do I enjoy. hehe!

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