A medical researcher has conducted tests on a new method of detecting hepatic (liver) tumors in heavy drinkers and wants to report his findings in the Journal of the American Medical Association. The following table shows his results.
Tumor No tumor Total
Positive 135 85 220
Negative 15 765 780
Total 150 850 1000
a. What is the prevalence of hepatic tumors?
b. What is the sensitivity of this test?
c. What it the false negative rate for this test?
d. What is the positive predictive value for this test?
e. Based on your answers would you consider using this test as a health professional? Explain your reasoning.