In the Chi-square test, my textbook says that degrees of freedom are the number of independent variables minus one ,df = n - 1(adsbygoogle = window.adsbygoogle || []).push({});

does this mean that that n is equal to the number of observed values from the equation aka the number of times I've added or the number of terms?

sum [(O-E)^2]/E

Is there an instance where it isn't equal to the number of observed values I have?

(there's an example in my book (but no answer) with an experiment with observed values of 2 trials of genetic crosses where observed in

trial 1 was 0.5

trial 2 was 0.3

but both of these values were measuring the same variable which was heterozygosity. The expected value is 0.8. Does this mean the df = 1? or is it 0 since there is only 1 independent variable?)

thank you so much

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# Chi Square Test In Genetics

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