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3 The label on a company's energy drinks claims that they contain an average caffeine concentration of 250 mg/oz. The mean caf- feine concentration

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3 The label on a company's energy drinks claims that they contain an average caffeine concentration of 250 mg/oz. The mean caf- feine concentration of 15 randomly sampled drinks was 267, with a standard deviation of 12.1. Are the drink labels accurate?

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