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). 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 X (cigarettes/day) 60 10 4 15 10 20 8 10 10 20 Ranks of X 12 6.5 2 9 6.5 1 10.5 4 3 6.5 6.5 10.5 Y (cotinine) 179 283 75.6 174 209 9.51 350 1.85 43.4 25.1 408 344 Ranks of Y 7 9 5 6 8 2 11 1 4 3 12 10