Answer Happy

A psychiatrist devised a short screening test for depression. We are evaluating the Accuracy metrics for this short test. The outcomes of the short test are compared with a gold standard for diagnosis of depression among 200 psychiatric outpatients. Assume that the gold standard is 100% accurate. Among the 50 outpatients found to be depressed according to the gold standard, 35 patients were positive for the short test. Among 150 patients found not to be depressed according to the gold standard, 30 patients were found to be positive for the test.
Question 1 1pts The sensitivity was 80% (The "true positive rate ′′= Sensitivity = the proportion of subjects with the disease correctly diagnosed by the test) True False Question 2 1pts The specificity was 80% (The "true negative rate ′′= Specificity = the proportion of subjects without the disease correctly excluded by the test) True False
Question 3 1 pts Among the 200 people, 50 are actually depressed, so the prevalence of depression was 25\%. True False