Answer Happy

9:32 Facebook Il 5G Back BMED3501_2A_2021.... 2. One new cancer diagnostic imaging method was applied to obtain images from a total of 80 normal and abnormal subjects. Images were then used by five readers or radiologists (A, B, C, D, and E) for medical diagnoses. All results are listed below. (10 points) BMED3501 Page 6 of 9 80 SUBJECTS SCREENED FOR CANCER 20 ABNORMAL SUBJECTS (ACTUALLY HAVING CANCER) 60 NORMAL SUBJECTS (ACTUALLY NOT HAVING CANCER) 20 60 Diagnosed as cancer positive Reader 1 0 0 0 Diagnosed as cancer negative 18 20 Diagnosed as cancer positive Reader 2 2 40 Diagnosed as cancer negative 11 15 Diagnosed as cancer positive Reader 3 9 45 Diagnosed as cancer negative 5 10 Reader 4 Diagnosed as cancer positive Diagnosed as cancer negative 15 50 0 0 Reader 5 Diagnosed as cancer positive Diagnosed as cancer negative 20 60 Calculate the sensitivity and specificity values for each of the five readers. b. Which two readers are doing the worst evaluation? Why? c. Use the five sets of sensitivity and specificity values calculated above to plot ROC curve, i.e., sensitivity vs. l-specificity. d. For this ROC curve, how do you approximately quantify the effectiveness of this new cancer imaging method?