[Solution Library] When nicotine is absorbed by the body, cotinine is produced. A measurement of cotinine in the body is therefore a good indicator of how


Question: When nicotine is absorbed by the body, cotinine is produced. A measurement of cotinine in the body is therefore a good indicator of how much a person smokes. Listed below are the reported number of cigarettes smoked per day and the measured amounts of cotinine (in ng/ml). (The values are from randomly selected subjects in a National Health Examination Survey.)

Is there a significant linear correlation?

How would you measure the cotinine level in the body?

Explain the result.

x (cigarettes per day) 60 10 4 15 10 1 20 8 7 10 10 20
y(cotinine) 179 283 75.6 174 209 9.51 350 1.85 43.4 25.1 408 344

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