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When people smoke, the nicotine they absorb is converted to cotinine,  which can be measured through blood tests. A random sample of 40  smokers has a mean cotinine level of 172.5 ng/ml. Assuming that = 119.5  ng.ml, test the claim that the mean cotinine level of all smokers is equal to  200.0 ng/ml. Use a 0.05 significance level ?

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