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[Solution Library] The nighttime cold medicine Dozenol bears the label indicating the presence of 80.0 mg of acetaminophen in each fluid ounce of the drug. The

Question: The nighttime cold medicine Dozenol bears the label indicating the presence of 80.0 mg of acetaminophen in each fluid ounce of the drug. The Food and Drug Administration randomly selected 49 one-ounce samples and found that the mean acetaminophen is 72.5 mg, whereas the standard deviation Is 8.6 mg. Use a twenty percent significance level and test the claim of the U.S. Food and Drug Administration that the mean Is significantly less than 80.0 mg. Assume the population standard deviation is known.

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