100,000 random people were tested for Condition A. Roberto's doctor told him he tested positive for Condition A. If the test is
99% accurate and Condition A is rare—one out of every thousand people have it. What is the probability that testing positive means Roberto has Condition A? answer choices
The answer would be: <span>99.0% </span> The disease is rare with a prevalence of <span>one out of every thousand people have it. That means, the chance of Roberto has the disease without any test would be 1/1000 or 0.1% The test sensitivity is 99%, which mean 99% of people with positive test result would have the disease. The chance is should not be influenced by the disease prevalence. </span>
