Posted: October 19th, 2016

c. What proportion of women who screen positive actually have ovarian cancer?

Problem 20: (3 marks)
Table 5–17 summarizes data collected in a study to evaluate a new screening test for ovarian cancer. A total of 200 women are involved in the study. Fifty have ovarian cancer and 150 do not. The results are tabulated below.
a. Find the sensitivity of the screening test.
b. Find the false positive fraction of the screening test.
c. What proportion of women who screen positive actually have ovarian cancer?

Table 5-17
Ovarian Cancer Free of Ovarian Cancer Total
Positive Screening Test 28 23 51
Negative Screening Test 22 127 149
Total 50 150 200