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标题: 求助 [打印本页]

作者: christineq    时间: 2004-3-15 17:38
标题: 求助

20.         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


(E) All laboratory tests to detect pironoma have the same proportion of false negative results.


    


为什么会是E呢?


作者: tangyi79    时间: 2004-3-15 19:33
All laboratory tests to detect pironoma have the same proportion of false negative results.


所有test的false negative results都一样。所以最好的就是其中的the laboratory test that has the lowest proportion of false positive results.






作者: christineq    时间: 2004-3-16 11:01
偶太笨了,还是不明白


既然All laboratory tests to detect pironoma have the same proportion


那么哪来的the laboratory test that has the lowest proportion ???




    






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