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In tests for pironoma, a serious disease, a false positive [#permalink]
22 Aug 2009, 06:35

00:00

A

B

C

D

E

Difficulty:

5% (low)

Question Stats:

83% (02:33) correct
17% (00:00) wrong based on 16 sessions

87. 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.

I am not satisfied with the explanation.. OA is E.. I did it first time perhaps and now i am not able to corelate howis it corelating with the argument..pls explain

Premise 1: a false positive result indicates that people have pironoma when, in fact, they do not;

Premise 2: a false negative result indicates that people do not have pironoma when, in fact, they do.

Conclusion: To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.

The conclusion that the author draws is unexpected because we should look for laboratories that have the lowest proportion of false negative results. However, the questions is asking for an answer choice that strengthens the argument.

Option E says that all the laboratories have the same proportion of false negative results. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

Consider the following example

Height is the most important feature for a basketball player, whereas speed is the second one. However, Richard is the best player in his team because he is the fastest.

What would make this conclusion be properly drawn?

All the players in Richard's team have the same height.

Last edited by mikeCoolBoy on 23 Aug 2009, 00:14, edited 1 time in total.

Premise 1: a false positive result indicates that people have pironoma when, in fact, they do not;

Premise 2: a false negative result indicates that people do not have pironoma when, in fact, they do.

Conclusion: To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.

The conclusion that the author draws is unexpected because we should look for laboratories that have the lowest proportion of false negative results. However, the questions is asking for an answer choice that strengthens the argument.

Option E says that all the laboratories have the same proportion of false negative. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

Consider the following example

Height is the most important feature for a basketball player, whereas speed is the second one. However, Richard is the best player in his team because he is the fastest.

What would make this conclusion be properly drawn?

All the players in Richard's team have the same height.

In other words, X and Y are two scenarios/situations that affect a conclusion.

When can we say that the conclusion depends ONLY on how X varies? =>Only when Y is constant or when it varies proportionately we can say that the conclusion entirely depends on how X varies.

Option E says that all the laboratories have the same proportion of false negative. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

All the players in Richard's team have the same height.

Economist wrote:

In other words, X and Y are two scenarios/situations that affect a conclusion.

When can we say that the conclusion depends ONLY on how X varies? =>Only when Y is constant or when it varies proportionately we can say that the conclusion entirely depends on how X varies.

But if the lowest proportion of false positive results are to be selected how can we say strengthen it by saying all have the same proportion. IF it is the case we can not select th lowest coz all are the same. ..

Option E says that all the laboratories have the same proportion of false negative. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

All the players in Richard's team have the same height.

Economist wrote:

In other words, X and Y are two scenarios/situations that affect a conclusion.

When can we say that the conclusion depends ONLY on how X varies? =>Only when Y is constant or when it varies proportionately we can say that the conclusion entirely depends on how X varies.

But if the lowest proportion of false positive results are to be selected how can we say strengthen it by saying all have the same proportion. IF it is the case we can not select th lowest coz all are the same. ..

Pls let me know what i am missing on?

watch out

all laboratories have the same proportion of FALSE NEGATIVE RESULTS NOT FALSE POSITIVE RESULTS

Option E says that all the laboratories have the same proportion of false negative. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

All the players in Richard's team have the same height.

Economist wrote:

In other words, X and Y are two scenarios/situations that affect a conclusion.

When can we say that the conclusion depends ONLY on how X varies? =>Only when Y is constant or when it varies proportionately we can say that the conclusion entirely depends on how X varies.

But if the lowest proportion of false positive results are to be selected how can we say strengthen it by saying all have the same proportion. IF it is the case we can not select th lowest coz all are the same. ..

Pls let me know what i am missing on?

watch out

all laboratories have the same proportion of FALSE NEGATIVE RESULTS NOT FALSE POSITIVE RESULTS

I got it this way.... Since none of the labs have a chance of saying the negative results perfectly, the only one who would atleast test the positive results closest should be chosen, sorta elimination for the labs given all other criterion being equal