Question (2): (15 Points) We list for 11 medical devices, their cost (X, in hundreds of dollars) and their rating (Y, on a scale from 0-100). The results are X 4 5 2.5 2 4 2.85 2.1 2.5 2 18 13 Y 90 90 85 83 78 78 75 70 68 63 61 (a) Find the correlation coefficient? Interpret it in words. (b) Find the equation of the regression line. (e) Find the coefficient of determination (R- square). Explain what it represents? (d) Estimate the rating when x=2.7?