The cold medicine Dozenal bears a label indicating the presence of 600 mg. of acetaminophen in each fluid ounce of the drug. The Food and Drug Administration randomly selected 65 one-ounce samples and found that the mean acetaminophen content is 589 mg. with a standard deviation equals 21 mg. Using an a = 0.01, test the claim of the manufacturer that the population mean is equal to 600 mg. Would you buy this cold medicine?

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