Question: A physical examination was used to screen for breast cancer in 2,500 women with biopsy-proven adenocarcinoma of the breast and in 5,000 age- and race-matched women without cancer. The results of the physical examination were positive (i.e. a mass was found) in 1,800 cases and in 800 non-cases. Calculate the sensitivity and specificity of the physical examination. (Set up your 2x2 table and show your calculations)