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In Testing for the Differences Between the Means of 2 n−1n - 1

Question 46

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In testing for the differences between the means of 2 independent populations where the variances in each population are unknown but assumed equal, the degrees of freedom are a) n−1n - 1 .
b) n1+n2−1n _ { 1 } + n _ { 2 } - 1 .
c) n1+n2−2n _ { 1 } + n _ { 2 } - 2 .
d) n−2n - 2 .

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