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For what percent of those tested for a certain infection was

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Manager
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For what percent of those tested for a certain infection was [#permalink] New post 02 May 2006, 02:30
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For what percent of those tested for a certain infection was the test accurate; that is, positive for those who had the infection and negative for those who did not have the infection?
(1) Of those who tested positive for the infection,1/8 did not have the infection.

(2) Of those tested for the infection, 90 percent tested negative.
Manager
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GMAT Tests User
 [#permalink] New post 02 May 2006, 06:57
Let's start with (2):

We know that 90% were tested negative and therefore,
10% were testet positive.

From (2):

We know that for 7/8 of those who were testet positive
the test was accurate.


Taken (1) and (2) together:

We know that the test failed at least for the 1/8 of the 10%
tested positive, but we have no idea how often the test failed
for the 90% who were tested negative.

Therefore, the answer is E.
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reply [#permalink] New post 02 May 2006, 07:15
I go with E too
because statement 1gives info about false positive result
nothing about false negative
St 2 also doesnt give info about false negative
both statements together dont give it either
So E it is
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 [#permalink] New post 03 May 2006, 05:28
Agree with E :wink:
  [#permalink] 03 May 2006, 05:28
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For what percent of those tested for a certain infection was

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