Question: 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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