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Homework Help: CHI square test - finding degree of freedom

  1. Oct 6, 2014 #1
    1. The problem statement, all variables and given/known data
    i have problem of finding the degree f freedom for this question. the ans for v is 3 , but my ans is v=n-1 , where n = 6 , so my v=5...

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Oct 6, 2014 #2


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    For the Chi Squared test, there is a minimum frequency needed for it to be accurate. I would expect that some of the less frequent observations were grouped or "binned" together to reduce your operational "n".
  4. Oct 6, 2014 #3

    Ray Vickson

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    Please type out the problem; you are not supposed to post thumbnails. (Read Vela's 'pinned' post called 'Guidelines for students and helpers', especially topic 4.) This morning I could not read your thumbnail on the medium I was using then.
  5. Oct 6, 2014 #4
    the question contains boxes. if i type out , it would look weird... so i would rather post the image of the original question
  6. Oct 6, 2014 #5


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    Did combining the lower frequency observations solve your problem getting to v=3?
    I think the general rule is frequency ## \geq## 5.
  7. Oct 6, 2014 #6
    thanks! question solved!
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