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. Assume that the population standard deviation is known to be 119.5, find a 90% confidence interval estimate of the mean cotinine level of all smokers. What aspect of this problem is not realistic?© BrainMass Inc. brainmass.com June 3, 2020, 9:56 pm ad1c9bdddf
This solution finds and interprets a confidence interval for the mean cotinine level of smokers.