Question

On discovering that her family had a 70% risk of heart attack erin took a treadmill test to check her own potential of having a heart attack the doctors told her that the reliability of the stress test is 67% what is the probability that erin will not have a heart attack and the test predicts that she will

Answer 1

"probability that erin will not have a heart attack, and the test predicts she will (have a heart attack"

to find this out, we would multiply (probability of *not* having a heart attack) * (the test gives a false positive)

step 1) probability of not having a heart attack = 1 - (probability of having a heart attack)

step 2) probability of a false positive = 1 - success rate of the test

multiply the above two probabilities together