8. Ginkgo for Dementia The herb ginkgo biloba is commonly used as a treatment prevent dementia. a the effectiveness of this treatment, 1545 elderly subjects were given ginkgo and 1524 elderly subjects were given a placebo. Among those in the ginkgo treatment group, 246 later developed dementia, and among those in the placebo group, 277 later developed demencia (based on data from "Ginkgo Biloba for Prevention of Dementia ," by DeKosky et al., Journal of the American Medical Association , Vol. 300No. 19 We want to use a 0.01 significance level to test the claim that ginkgo is effective in prevent ing dementia .

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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.