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July 15th, 2010, 03:37 PM   #1
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Probability that fit describes data correctly

I have fitted a sinus function to a set of data and from the plot it seems like a good fit. The observed (calculated) Chi-square value is 30.5 and the expected Chi-square value is 34.

Are these Chi-square values enough to say something about the probabilty of my fit describing the data correctly, or do I need something else for that?
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