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Thread: Sign Test

  1. #1
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    Sign Test

    https://imgur.com/a/CfwpZ

    https://imgur.com/a/nCM0I

    https://imgur.com/a/P2SQK

    Sign Test-771.pngSign Test-772.pngSign Test-773.png
    In the photo above ,
    H0 = the position of the plant doesnt affect the number of seeds in the pods .
    H1 = position of the plant affect the number of seeds in the pods




    This is a two -tailed test , am i right ? Referring to the normal distribution table , z α=0.05 = 1.645 , z α/2=0.025 = 1.960 ... In the example , it's clear that the author use one -tailed test . I think it's wrong . He should use z α/2=0.025 = 1.960 , Am i right ? Correct me if i am wrong .
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  2. #2
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    Re: Sign Test

    Yes, there is a mismatch between the problem formulation (two-tailed) and the way the Z-statistic is evaluated (one-tailed).
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  3. #3
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    Re: Sign Test

    Quote Originally Posted by stans View Post
    Yes, there is a mismatch between the problem formulation (two-tailed) and the way the Z-statistic is evaluated (one-tailed).
    So, should it be two tailed test and 0.5alpha =0.0025 is used?
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  4. #4
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    Re: Sign Test

    Quote Originally Posted by stans View Post
    Yes, there is a mismatch between the problem formulation (two-tailed) and the way the Z-statistic is evaluated (one-tailed).
    Or i could be wrong ? For sign test , alpha is taken as one tailed value although it's 2 tailed test ??
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