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The formula for the total degrees of freedom for the independent-samples t test is ___. Group of answer choices (N1-1)(N2-1) N-1 N1+ N2 df1+ df2
The formula for the total degrees of freedom for the independent-samplesttest is ___.
Group of answer choices
(N1-1)(N2-1)
N-1
N1+ N2
df1+ df2
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