Problem 3. Use the information provided below to calculate the necessary measures, construct a ROC curve, and identify the best cutpoint based on the ROC curve. Cutpoint True Positives True Negatives Screened Positive Screened Negative <1 20 35 45 75 3 45 45 69 51 5 45 60 48 72 8 28 35 47 73 10 50 48 72 48 19. Use this area to calculate the necessary measures. [2] (15 points) Cutpoint Sens Spec 1-Spec <1 A B 3 D E 5 H 8 J K 10 M N Use the grid below to construct a ROC Curve. You must label the axes. (7 points) ROC Curve 21. Which cutpoint is the best choice and why? (3 points)