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Degrees of freedom of repeated measure ANOVA

What of the following is true for the repeated-measures t statistic?

df = n1 + n2 - 2
df = n - 1
df = n1 + n2 - 1
df = (n1 - 1) + (n2 - 1)

Solution Summary

Formula for degrees of freedom of repeated measure ANOVA is given in the answer

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