example: 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. Calculate a 95% confidence interval for μ the true mean value of acetaminophen in Dozenol.