CHI square test - finding degree of freedom

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Homework Help Overview

The discussion revolves around determining the degrees of freedom for a Chi-squared test. The original poster expresses confusion regarding the calculation, stating that their result differs from the expected answer.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the necessary conditions for the Chi-squared test, including the requirement for minimum frequency in observations. There is also a focus on the implications of combining lower frequency observations to adjust the degrees of freedom.

Discussion Status

The conversation is active, with participants questioning the assumptions behind the calculations and exploring the impact of data grouping on the degrees of freedom. Some guidance regarding the minimum frequency requirement has been provided, but no consensus has been reached on the correct approach.

Contextual Notes

There are constraints regarding the format of the problem statement, as some participants mention difficulties in interpreting the original question due to the use of images instead of text.

gxc9800
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Homework Statement


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...

Homework Equations

The Attempt at a Solution

 

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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".
 
gxc9800 said:

Homework Statement


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...

Homework Equations

The Attempt at a Solution

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.
 
Ray Vickson said:
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.
the question contains boxes. if i type out , it would look weird... so i would rather post the image of the original question
 
Did combining the lower frequency observations solve your problem getting to v=3?
I think the general rule is frequency ## \geq## 5.
 
RUber said:
Did combining the lower frequency observations solve your problem getting to v=3?
I think the general rule is frequency ## \geq## 5.
thanks! question solved!
 

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