Smoking and Cotinine: A measurement of cotinine in thebody is a good indicator o

Question

Smoking and Cotinine: A measurement of cotinine in thebody is a good indicator of how much a person smokes. Beloware randomly selected subjects in the National Health ExamSurvey. Is there a linear correlation? x (cigarettes per day) 60      10      4       15     10    1       20     8        7    10       10      20 y(continine)             179   283      75.6   174    209  9.51   350  1.85   43.4 25.1   408     344 Smoking and Cotinine: A measurement of cotinine in thebody is a good indicator of how much a person smokes. Beloware randomly selected subjects in the National Health ExamSurvey. Is there a linear correlation? x (cigarettes per day) 60      10      4       15     10    1       20     8        7    10       10      20 y(continine)             179   283      75.6   174    209  9.51   350  1.85   43.4 25.1   408     344

Explanation / Answer

Sxy = xy - xy/n Sxx = x2 - (x)2/n Syy = y2 - (y)2/n r = Sxy/(Sxx Syy) Use these formulae with the data above to calculate the correlationcoefficient (r) to get your answer.

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