Dr. Barba, like most doctors, tends to the probability that a person has a disease when a test result is positive. To accurately calculate this probability, one of the factors that Dr. Barba needs to know is the percentage of people in the population who actually have the disease, which is known as the rate.

Iam a german monk and professor of theology. i believe that the catholic church's practice of buying forgiveness of sins through indulgences is wrong. i have translated the bible into german to make it easier for more people to be able to study it. i am here to stand by my writings and i refuse your demand that i recant them