If an athlete uses steroids, probability that test will detect the steroids is 0.98. Pierre Vitesse, internationally known cyclist as well as competitor in the Toursist-De-France bicycle race, has tested positive for the steroid. The probability that he actually took steroids is:
A. Is the same as the probability that the test declares the athlete steroid-free given that he or she really is steroid-free.
B. Can't be determined without knowing the probability that the test falsely says that steroids have been detected in an innocent person.
C. 0.98, since that is the probability the test catches steroid use.
D. Is 0.02, since we must find the complementary event.