(See Solution) A cigarette manufacturer claims the average nicotine content of one of its brands of cigarettes is 10 grams. In a sample of 25 cigarettes
Question: A cigarette manufacturer claims the average nicotine content of one of its brands of cigarettes is 10 grams. In a sample of 25 cigarettes of this brand, the average nicotine content was 12 grams with a standard deviation of 2 grams. Is the manufacturer's claim tenable? Test at a five-percent level of significance.
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