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certain brand of cigarettes is advertised by manufacturer as having mean nicotine content of 15mg/cigarette.a sample of 200 cigarettes is tested by lab and found
certain brand of cigarettes is advertised by manufacturer as having mean nicotine content of 15mg/cigarette.a sample of 200 cigarettes is tested by lab and found to have average of 15.76mg of nicotine with known SD=3.5.using a 0.01 level of significance ,can we conclude that actual mean nicotine content of this is greater than 15mg?
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