2.3 An article in The New York Times (Feb. 17, 1999) about the PSA blood test for detecting prostate cancer stated: "The test fails to detect prostate cancer in 1 in 4 men who have the disease (false-negative results), and as many as two-thirds of the men tested receive false-positive results." Let C(C) denote the event of having (not having) prostate cancer, and let +(-) denote a positive (negative) test result. Which is true: P(-|C) = $$1/4$$ or P(C|-) = $$1/4$$? Determine the sensitivity and specificity.

$$P(-|C) = 1/4$$ or $$P(C|+) = 2/3$$ or $$P(+|C) = 2/3$$? Determine the