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?
0.37
0.43
0.51
0.67
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?
0.37
0.43
0.51
0.67
0.92

mike1015 · Answer

@rebeccaxhawaii can you help

jsizzie101 · Answer

The probability would be 25% that they used steroids and tested positive. so I think the closest answer I can give you from the chooses you gave is 0.43 even though the answer is 0.44.

mike1015 · Answer

can you explain how you did it @jsizzie101

jsizzie101 · Answer

yah I don't know how I did it

jsizzie101 · Answer

wait I think I may have figured it out... although I don't know where I got the 25%, I do know that however I got that 25%, I took it, put it in its decimal form of 0.25 and divided it by the decimal form of 11% which is 0.11.