Please Help No Idea!!
I HAVE NO IDEA ON THIS ONE IM SO LOST
A geologist is using seismographs to test for oil. It is found that if oil is present, the test gives a positive result 95% of the time, and if oil is not present, the test gives a positive result 2% of the time. Oil is actually present in 1% of the cases tested. If the test shows positive, what is the probability that oil is present??????
(solved in either a tree diagram, contingency table or proper formula and substitution)
You need to get Pr(oil|+ve).
Originally Posted by jobear
A tree diagram is the easiest approach to take.
Start with the oil:
\no oil (0.99)
and then add the +ve test and -ve test branches for each.
You should get as the answer:
Alternatively, you can chew on what the good Captain has said at your double post.