asmi
Forum Hero
Topics: 1043
Posts: 4,609
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Can anybody help me in understanding the calculation for probability.
* The probability of Hepatitis B P(D+) in a certain pt population is known to be 0.20 ,conversely P(D-)=0.80 .In a study of new diagnositc test for Hepatitis B, the probability of positive test result among pt's known to have hepatitis B ,P(T+(D+), is shown to be 0.90.,where as probability that healthy pt will have negative result ,P(T-(D-), is shown to be 0.95 .What is the probability that a new pt with a negative test is truly healthy ?
A. 0.95
B. 0.95 X 0.80
( 0.95 X 0.80) +(0.5 X0.80)
C. .95 X.20
( .95 X.80 )+(.90 X 0.20)
D. .95 X.80
( .95 X .80)+(.90 X.20)
E. none
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| reet
Forum Fanatic
Topics: 152
Posts: 1,411
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___________________
Live as u were to die tommorow. Learn as if u were to live forever.
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| satyaking
Forum Junior
Topics: 5
Posts: 58
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Well yaar,he is asking nothing but NPV and the answer in them is none
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