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it is known that 20% of a certain species of insect exhibit a particular characteristic A....

it is known that 20% of a certain species of insect exhibit a particular characteristic A. Eighteen insects of that species are obtained from an unusual environment, and none of these have characteristic A. Is it reasonable to assume that insects from that environment have the same probability of 0.20 that the species in general have? Use a two-tailed test.

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