When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A sample of 70 smokers has a mean cotinine level of 178.3. Assuming that ơ is known to be 124.5, find a 90%...

Extracted text: When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A sample of 70 smokers has a mean cotinine level of 178.3. Assuming that ơ is known to be 124.5, find a 90% confidence interval estimate of the mean cotinine level of all smokers. Confidence Interval: ( Enter numbers correct to one decimal place.