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A manufacturer of a Pharmaceutical claims that their pain killer pills have 5 mg of Codeine....

A manufacturer of a Pharmaceutical claims that their pain killer pills have 5 mg of Codeine. Their research quality control manager takes a random sample of 20 pills. She calculates the sample average to be 4.238 mg. with a standard deviation of .217 lb. At the .05 level of significance, is the manufacturer correct?

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