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For what percent of those tested for a certain infection was

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For what percent of those tested for a certain infection was [#permalink] New post 01 May 2008, 21:30
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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.
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Re: DS:percent [#permalink] New post 01 May 2008, 21:44
E, because we still don't know the percent of inaccuracy for the negative group.
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Re: DS:percent [#permalink] New post 01 May 2008, 22:36
Should we assume negative tests are not 100% accurate since question does not say so anywhere explicitly...!!!
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Re: DS:percent [#permalink] New post 02 May 2008, 04:46
C, but not sure. I think its c because we know how many people did not have it from stat 1, and from stat 2 we know how many people the test said did not have it.
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Re: DS:percent [#permalink] New post 02 May 2008, 05:55
puma wrote:
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.




Z--> .9z test negative so .1z test positive.

1/80z+ 7/80z =.1z


The answer should be E b/c we know nothing about the 90% who tested negative.
Re: DS:percent   [#permalink] 02 May 2008, 05:55
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