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When people smoke, the nicotine they absorb is converted into cotinine, which can be measured. A random sample of 40 smokers is selected, and they...

When people smoke, the nicotine they absorb is converted into cotinine, which
can be measured. A random sample of 40 smokers is selected, and they are found to have a mean
cotinine level of 172.5. Assume σ = 119.5 is known from a previous study and that cotinine levels
are normally distributed.

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