The herb ginkgo biloba is commonly used as a treatment to prevent dementia. In a study of its effectiveness, 2015 elderly subjects were given ginkgo and 1337 elderly subjects were given a placebo. Among those in the ginkgo group, 207 later developed dementia, and among those in the placebo group, 179 developed dementia. Use a 0.1 significance level to test the claim that ginkgo is effective in preventing dementia. Based on your results, is ginkgo effective in preventing dementia?

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