请教此题，怎么想不明白？
In tests for P, a serious disease, a false positive result indicates that people have P when in fact they do not: a false negative result indicates that people do not have P when in fact they do. To detect P most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.
题目问何选项支持以上建议？ 答案为 All laboratary tests to detect P have the same proportion of false negative results.
谢谢！作者: hopejie 时间: 2003-11-16 23:06
本题目的结论是：To detect P most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results。 前面说无论是positive result 还是negative result 都会有错误。那么如果把答案中的话加入到题中，就是：如果所有的false negative results都一样的话，那么探测P的准确率只取决于false positive results.的多少，所以选比例最低的，一定可以达到最好的结果的。作者: 0711 时间: 2003-11-17 14:08
清楚了，谢谢HOPEJIE！
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