Suppose you have data that shows that 12% of athletes test positive for steroids. You also know that 11% of athletes test positive for steroids and actually use steroids. What is the probability that an athlete uses steroids, given that he tests positive?
A.
0.37
B.
0.43
C.
0.51
D.
0.67
E.
0.92

Question

Suppose you have data that shows that 12% of athletes test positive for steroids. You also know that 11% of athletes test positive for steroids and actually use steroids. What is the probability that an athlete uses steroids, given that he tests positive?
A. 
0.37
B. 
0.43
C. 
0.51
D. 
0.67
E. 
0.92

jhonyy9 · Answer

any idea ?

Vocaloid · Answer

conditional probability

What is the probability that an athlete uses steroids, given that he tests positive? ---> P(using steroids and testing positive | testing positive) = P(using steroids and testing positive) / P(testing positive)