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Question 3: To construct an interval estimate for the difference between the means of two populations when the standard deviations of the two populations are

Question 3:

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 atdistribution with _____ degrees of freedom.Letn1be the size of sample 1 andn2the size of sample 2.

Question 3 options:

n1+n2

n1+n2- 1

n1+n2- 2

n1-n2+ 2

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