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Forum index » Science and Technology » Math » Probability
A Conditional Probability Question (Diagnstic Test)
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Mike Terry
science forum Guru Wannabe


Joined: 02 May 2005
Posts: 137

PostPosted: Thu Jun 15, 2006 6:01 pm    Post subject: Re: A Conditional Probability Question (Diagnstic Test) Reply with quote

"Nick" <chanlikhangnick@gmail.com> wrote in message
news:1150333475.220142.94960@y41g2000cwy.googlegroups.com...
Quote:
A diagnstic test:
a person has the disease the test gives a positive result 99% of the
time
while an individual without the disease will show a positive result 2%
of the time

Let A be the event "test positive," and
B the "person really has disease."

Can I conclude the followings?

P(A | B) = 0.99, P(not A | B) = 0.01,
P(A | not B) = 0.02, P(not A | not B) = 0.98


Yes.
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Nick11111
science forum beginner


Joined: 14 Feb 2006
Posts: 6

PostPosted: Thu Jun 15, 2006 1:04 am    Post subject: A Conditional Probability Question (Diagnstic Test) Reply with quote

A diagnstic test:
a person has the disease the test gives a positive result 99% of the
time
while an individual without the disease will show a positive result 2%
of the time

Let A be the event "test positive," and
B the "person really has disease."

Can I conclude the followings?

P(A | B) = 0.99, P(not A | B) = 0.01,
P(A | not B) = 0.02, P(not A | not B) = 0.98
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