Five hundred women are enrolled in a study to evaluate the a…
Five hundred women are enrolled in a study to evaluate the accuracy of a test for pregnancy. 200 of the women were actually pregnant. 170 of the pregnant women had a positive test as did 140 of the women who were not pregnant. What is the probability (i.e., specificity) that a woman tested negative on a test given that she is not pregnant? Test Pregnant? Yes No Total + 170 140 310 – 30 160 190 Total 200 300 500