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 as person smokes. Listed below are the reported numbers of cigarettes smoked per day and the measured amounts of nicotine (in ng/ml). (The values are from randomly selected subjects in the National Health Examination Survey). X i- ii- Is there a significant linear correlation? Explain the result. Use the rank correlation coefficient to test for a correlation between the two variables and explain via scatterplots why the rank correlation is preferred in this context. 60 10 4 20 8 10 10 20 (cigarettes/day) Ranks of X Y (cotinine) Ranks of Y 12 6.5 2 179 283 9 75.6 5 15 10 1 9 6.5 1 209 174 6 8 2 9.51 7 10.5 4 3 350 1.85 11 43.4 4 6.5 6.5 10.5 25.1 408 344 12 10