biostatistics help please

5. 120 patients with pre-diabetes were tested for levels of hemoglobin Alc (a form of hemoglobin) 90 were found to have levels above 6.0. On the other hand, in patients without this disease, only 15 out of 50 of these controls had such levels. a. Compute the false positive and false negative rates of the hemoglobin Alc test for pre- diabetes (7 points). b. Suppose the cut point was increased to 6.5, what would happen to the false positive and false negative rates (increase, decrease or stay the same; answer for each) (4 pts) c. The negative predictive value of a test is the percentage of negative values that don't have the disease. What is the negative predictive value of the test? (7 pts)