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10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point)12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B? (1 point) 13) 20 People have disease and 80 people do not have a disease. The sensitivity of the test is 0.75. The specificity of the test is 0.60. Fill in the following table ( points) Disease Present No Disease Present Total Test+ Test -

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Answer #1

10.Solution :- Given that,

Diseased 100 10 Not Diseased 20 80 Test t Test

Sensitivity = (100/(100+10)) = 100/110= 0.909

Specificity = (80/(80+20)) = 80/100 = 0.80

False positive = 100/20 =5

12 .Solution :- Given that,

Sensitivity = (34/(34+2)) = 34/36 = 17/18

Specificity = (13/(13+8)) = 13/21

False positive =34/8 = 17/4

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