A researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a mean different from the 600mg claimed by the manufacturer. Test this claim at the 2% level of significance. The mean acetaminophen content for a random sample of n=48 tablets is 605mg. Assume that the population standard deviation is 4.8mg. Perform a hypothesis test for the population mean. Assume preliminary data indicate that it is reasonable to apply the z-test. Use the critical-value approach.
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