A group of medical professionals uses a common diagnostic test to determine whether patients have a certain disease (called disease A for the purposes of this activity). Let’s assume the diagnostic test for disease A is positive for all the patients who have the disease, but the test is also positive for 5% of those who don’t have the disease. The test is performed on a randomly selected person of a city’s population, where 40 out of every 200,000 people have disease A. In this activity, you will use probability calculations to assess the medical test results for disease A.