All of us undergo medical tests at various times in our lives. Some of us are te

Question

All of us undergo medical tests at various times in our lives. Some of us are tested for drug use. when we apply for jobs, some of us are tested for disease. When we exhibit fever or other symptoms, some of us are tested for a variety of disorders. When we undergo routine physical examination, and some of us undergo tests for pregnancy. Because such test typically provide some wrong results, it is important that we, along with our physicians, understand how to correctly results. We should know that a positive test result does not necessarily mean that a condition is present, and we should know that a negative test result does not necessarily mean that the condition is not present.

Explanation / Answer

a) total = 17 +6 +2+ 652 = 677

false positive = 2/677

2) true positive = 17/677

3)false negative = 6/677

4)true negative = 652/677

5) sensiitivity = 17/(17+6) =17/23

6)Specificity = 652/(652+2) =652/654

7) positive predicted value = 17/(17+2) =17/19

8)negative predicted value = 652/(652 + 6) = 652/658

9) P(subject is infected| positive test result) = (17/(17+2) =17/19

P(positive test result | subject is infected) = 17/(17 + 6) =17/23

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