Question: (NColumns -1) (NRows -1) is the formula for the degrees of freedom for: 1) the chi-square test for goodness of fit 2) the chi-square test
"(NColumns -1) (NRows -1)" is the formula for the degrees of freedom for:
1) the chi-square test for goodness of fit
2) the chi-square test for independence
3) the within-group estimate of a two-way analysis of variance
4) all of the above

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