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- The cold medicine Dozenol lists 600 milligrams of acetaminophen per fluid ounce as an active ingredient. The FDA tests 45 one-ounce samples of the medicine and finds that the mean amount of acetaminophen for the sample is 598 mg with a standard deviation of 2.1 mg. Test the company’s claim that the medicine contains the required amount of acetaminophen at α = 0.05.
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