SOLUTION: QUESTION 17 A disease has an incidence rate of 0.9%. A test for the disease has a false positive rate of 4% and a false negative rate of 1%. What is the probability that a per

Question 1191523: QUESTION 17
A disease has an incidence rate of 0.9%. A test for the disease has a false positive rate of 4% and a false negative rate of 1%. What is the probability that a person receiving a positive test actually has the disease?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
This is an incidence rate of 9 per 1000 or 90 per 10000
======D+=======D-====Total
T+-----86.4---------99.1===185.5
T-==== 3.6--------9810.9==9814.5
Total==90=======9910===10000
true positive rate is 96% T+/D+(sensitive) and specificity D-/T- is 99%.
If a person has a positive test (185.5) they have the disease (86.4) or 46.58% of the time.
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