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# In tests for pironoma, a serious disease, a false positive

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In tests for pironoma, a serious disease, a false positive [#permalink]

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25 Mar 2007, 12:16
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In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.
Which of the following, if true, gives the most support to the recommendation above?
(A) The accepted treatment for pironoma does not have damaging side effects.
(B) The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma.
(C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
(D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.
(E) All laboratory tests to detect pironoma have the same proportion of false negative results.

OA later.
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25 Mar 2007, 23:29
B seems correct.
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25 Mar 2007, 23:59
I choose B
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26 Mar 2007, 00:32
One and only (E)
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26 Mar 2007, 08:58
Swagatalakshmi wrote:
One and only (E)

OA is E. However, like those of above, my choice is B too.
Can Swagatalakshmi explain why is E rather than B please? Thank you
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27 Mar 2007, 08:01
wudy wrote:
Swagatalakshmi wrote:
One and only (E)

OA is E. However, like those of above, my choice is B too.
Can Swagatalakshmi explain why is E rather than B please? Thank you

That set of tests would have the most accurate results.
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27 Mar 2007, 20:27
It would be E...

The paragraph basically says that there are 2 types of false results for a pironoma test (either positive or negative)...

so, it would be wrong to say that the piranoma test with the lowest proportion of false POSITIVES would result in the most accurate test, simply because the test with the lowest proportion of false positives may also have the HIGHEST proportion of false NEGATIVES...

so for the statement to be accurate, the proportion of false negatives must be the same for every test... therefore making the only variable in the equation the proportion of false positives...
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27 Mar 2007, 20:34
E.
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27 Mar 2007, 21:44
E it is

with an example

False Neg: 100

False +ve : 10 using test1
False +ve : 5 using test2

the arg is saying use test2.

That is true only if FalseNeg is 100 for both test1 and test2. If test2 has say 40 falseneg then test1 is better

E is saying FalseNeg is 100 for both tests
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28 Mar 2007, 00:01
If your read the argument carefully, a false negative is much more serious than a false positive. So ideally, one should go for a test with minimum number of false negative results. Since, the physicians have gone for the test with minimum number of false positive results, it is obvious that they had no control over minimum number of false negatives. Hence the best case scenario is that all tests have equal likelihood of false negative results.
28 Mar 2007, 00:01
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