Question

9.7 Suppose that the manufacturer of UltraChic cigarettes claims that the average nicotine con- tent does not exceed 3.5 mg per cigarette. Based on prior studies, we know that nicotine content tends to be normally distributed. We collect a random sample of 10 cigarettes, make measure- ments in an independent laboratory, and deter mine the sample mean to be 4.2 mg, with a standard deviation of 1.4 mg nicotine per ciga- rette. Are these data consistent with the manu- facturers claim?
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