When developing an interval estimate for the difference between two population means with sample sizes of n₁ and n₂, A) n₁ must be equal to n₂. B) n₁ must be smaller than n₂. C) n₁ must be larger than n₂. D) n₁ and n₂ can be of different sizes.

Question

Quizplus · Accepted Answer

The sample sizes of the two populations being compared do not need to be equal, so D is the correct choice. However, it is important that the sample sizes are both sufficiently large (i.e. at least 30) in order for the interval estimate to be valid.

When Developing an Interval Estimate for the Difference Between Two