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Question
To construct an interval estimate for the difference between the means of two populations when the standard deviations of the two populations are unknown, we must use a tdistribution with (let n1be the size of sample 1 and n2the size of sample 2)a. (n1+ n2) degrees of freedom
b. (n1+ n2-1) degrees of freedom
c. (n1+ n2-2) degrees of freedom
d. n1-n2+ 2
Answer
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