Biostatistics & Research · single question
A new COVID test is performed on 3000 patients. Results: Sick patients — 870 positive, 10 negative. Healthy patients — 45 positive, 2100 negative. What is the sensitivity of this test?
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Correct answer: D. 99%
Sensitivity = True Positives / (True Positives + False Negatives) = 870 / (870 + 10) = 870/880 ≈ 98.9%, which rounds to 99%. (Specificity, by contrast, would be 2100/(2100+45) ≈ 97.9%.)
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