This edition: Comparing Two Proportions
This lesson introduces the concept of two-sample proportions. Researchers use two-sample proportions to compare one group to another, which often involves comparing one treatment to another. You will learn how to use the two-sample method with data expressed in terms of a proportion of defined successes, including how to find confidence intervals and do tests of significance.
Again, the idea is to make judgments about the population under study. With two-sample proportions, researchers aim to compare two populations by once again using the assumptions of the Normal distribution. Knowing the proportional makeup of two target populations is yet another important tool statisticians use. In this lesson, you’ll see how this idea works when applied to how successful certain student populations are, or to treatments meant to help prevent dementia among different populations of the elderly.