Determine how common the condition in Question 9.5 must be for you to be 90% sure that a positive test result means that you have the condition. You should still assume that the test is 99% accurate.

Question 9.5

A new medical test has recently been approved to test for a rare genetic condition. The test is known to be 99% accurate. You ask that your doctor perform this test on you and the result comes back positive, that is, the test identifies you as having the condition. Calculate the probability that you do not actually have the condition in the following situations.