87. In test 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 other laboratory tests used to detect pironoma.
(C) In treating pironoma patients, it is essential to begin treatment as early as do 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 negeative results.
fail prositive，没有病说有 fail negetive，有说没有
要最accurate，就是宁可错杀3000不可放过一个，当然要用lowerst negetive。
为什么conclusion说positive?? e为什么加强了 结论呢？？
我知道我的思路很好笑，请解惑
谢谢
最准确就是像您想的那样么，哈哈，mm太强了。最准确应该是尽量减少误差，而如果所有办法在得出假阳性结论的可能性是一样的，那么就要减少假阴性就可以了，所以支持了结论。
这题我还是不明白,有高人再给解释解释吧,
fail prositive，没有病说有 fail negetive，有说没有
要最accurate，就是要有最少的false 结果.
如果all tests 有同样的比例的false negatives,那么最accurate 的就是有最少比例的false positives.
不知道我有没有说明白．
If all tests have the same
proportion of false negatives, then the most accurate is the one that has the lowest proportion of false positives.
this is the explaination of the og.u can find the answer from it if u can understand it well.
by the way ,this problem is similar to og100.
hope cab be helpful.
题目问the lowest proportion of false positive results
答案(E) All laboratory tests to detect pironoma have the same proportion of false negeative results.
我不明白，这不是重复了一个自相矛盾的意思吗？
forjoke的解释很完美了，无论是false positive results还是false negeative results都是false的结果。实验要将这种false结果降至最低，使用false positive results最低这种方法，如果要该方法有效，则要保证the same proportion of false negeative results。
就像A+B=C，要C最小于是要B最小，前提是A的值不变（当然A最小更好），否则A的值变大B变小也可能使C变大。
明白这道题目了，现有的测试方法都会产生假阳性和假阴性的错误结果，那么评价哪种测试方法最好的标准就是假阳性和假阴性的比例都低。题目中的conclusion已经说明laboratory test产生假阳性的比例最低，那么只有强调laboratory test产生的假阴性的比例也最低才能证明conclusion的成立。
这道题一开始我也错了，就是没有注意到conclusion里面只说明了判断的一方面而未提及另一方面。
不当之处还请NN指教！
终于明白了
谢谢各位nn
最准确就是像您想的那样么，哈哈，mm太强了。最准确应该是尽量减少误差，而如果所有办法在得出假阳性结论的可能性是一样的，那么就要减少假阴性就可以了，所以支持了结论。
顶上来看看
这道题算什么题型？加强支持题？还是前提假设型？
我觉得更像前提假设题。
有人有类似的看法吗？
对。你是正解。不是最小，而是没有办法判断是否大小。
A是因变量，P和N是自变量
A=P+N（这是题中的暗示前提），结论是A最小需要P最小，如果N不变的话，结论就成立，这道题也可以作为Assumption题。
但若N也是变量的话，A就不取决于P了，结论就不成立。
| 欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |