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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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