A patient is given drip feed containing a particular chemical and its concentration in his blood is measured, in suitable units at one hour intervals. The doctors believe that a linear relationship will exist between the variables. Solve for the correlation coefficient, r. Time, x (hours) Concentration, y 1 3. 2.4 4.3 5.0 6.9 9.1 11.4 13.5 0.972 0.992 0.984 0.921

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