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A cold medicine lists 600 milligrams of acetaminophen per fluid ounce as an active ingredient. A test of 65 one-ounce samples of the medicine finds

A cold medicine lists 600 milligrams of acetaminophen per fluid ounce as an active ingredient. A test of 65 one-ounce samples of the medicine finds that the mean amount of acetaminophen for the sample is 596 milligrams with a standard deviation of 20 milligrams. Test the claim that the medicine does not contain the required amount of acetaminophen. Use a 0.05 significance level. Find the Z score

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