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Thread: 1 tailed test or two tailed?

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    1 tailed test or two tailed?




    A researcher would like to know if oxygen deprivation at the time of birth has a negative effect on IQ.

    My Answer:

    1-tailed, right? I just wanted to make sure.

    & if I am using an alpha of .01, would that make that correspod with a z-score -2.33?

    Thank You
    Last edited by i need a brain; 06-04-2008 at 06:36 PM.

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    Quote Originally Posted by i need a brain View Post
    A researcher would like to know if oxygen deprivation at the time of birth has a negative effect on IQ.

    My Answer:

    1-tailed, right? I just wanted to make sure.

    & if I am using an alpha of .01, would that make that correspod with a z-score -2.33?

    Thank You
    Yep sounds like a one-tailed, and that's the z-score too.

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