Problem:
A certain Freudian psychoanalyst believes that almost everyone has had a traumatic childhood, so he tells nine out of every ten patients, whatever they report or remember that they are repressing some traumatic memories from childhood.
A false positive rate is the percentage of (actually) negative cases where a test or diagnostic returns a (mistaken) positive result. It is the probability of a positive test for a condition given that the condition is not present. What is the psychoanalyst's false positive rate? A false negative rate is the percentage of actually positive cases that a test or diagnostic fails to positively identify (where it returns a (mistaken) negative result). What is the psychoanalyst's false negative rate?