A new diagnostic test for Disease X was studied in a population of 1,000 people. Among these, 200 individuals actually had the disease, as confirmed by the gold standard test. The diagnostic test correctly identified 180 of these individuals as positive for Disease X, but it failed to identify 20 people who had the disease.
What is the sensitivity of the test?
A diagnostic test for Disease Y was evaluated in a population where 10% of people have the disease. The test has a specificity of 95% and a sensitivity of 85%. The test was performed on 1,000 people, and 900 were disease-free.
How many false positives would you expect in this population?
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