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

Question 77

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In testing for differences between the means of 2 related populations where the variance of the differences is unknown, 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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