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# finding degrees of freedom in chi squared!! watch

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1. hey! v confused!! in the little AQA collins book it says that you can find the degrees of freedom by:
(rows-1) * (times!!) (columns -1)???

but in the big text book, it says just categories, and you get different answers depending on which formulae type thing you use!!! (ie one of them must be wrong!!!)
how do you do it properly!!! i thought i knew how to do it but i dont and the exam is tomorrow!!!! eeek!
2. categories - 1, just realised i hadnt put that in! sorry!
3. (Original post by Emma18)
categories - 1, just realised i hadnt put that in! sorry!
That's what it is though : categories - 1. What is it you don't understand?
4. It depends on how many df there are.
If its a two by two grid, theres one formula, while if theres any more either way, its a different formula.
I actually have a spreadsheet i put together to calculate the 2 by 2 grid...
5. im doing that exam too, just remember number of categories-1! thats what all my books say
6. so a category is what is different in the experiment?? you have your groups of individual.....lions or whatever, and the different conditions that you are observing them under, and taking frequency data from, are the catergories??? is that right??
7. (Original post by Emma18)
so a category is what is different in the experiment?? you have your groups of individual.....lions or whatever, and the different conditions that you are observing them under, and taking frequency data from, are the catergories??? is that right??
yeah, i would say the variable is the categories..! which is basically what you said so yeah!

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