In an article about investment alternatives, Money magazine reported that drug stocks provide a potential for longterm growth, with over 50% of the adult population of the United States taking prescription drugs on a regular basis. For adults age 65 and older, 84% take prescription drugs regularly. For adults age 18 to 64, 47% take prescription drugs regularly. The age 18-64 age group accounts for 81% of the adult population. Given an adult takes prescription drugs regularly, what is the probability that the adult is 65 or older?

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.