# CHI square test - finding degree of freedom

1. Oct 6, 2014

### gxc9800

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

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2. Oct 6, 2014

### RUber

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".

3. Oct 6, 2014

### Ray Vickson

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.

4. Oct 6, 2014

### gxc9800

the question contains boxes. if i type out , it would look weird... so i would rather post the image of the original question

5. Oct 6, 2014

### RUber

Did combining the lower frequency observations solve your problem getting to v=3?
I think the general rule is frequency $\geq$ 5.

6. Oct 6, 2014

### gxc9800

thanks! question solved!