Cotinine levels of smokers - When people smoke, the nicotine they absorb is converted to cotinine, w
Question: Cotinine levels of smokers – When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A sample of 40 smokers has a mean cotinine level of 172.5. Assuming that \(\sigma \) is known to be 119.5, find a 90% confidence interval estimate of the mean cotinine levels of all smokers. What aspect of this problem is not realistic?
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