作者pennymany (Penny)
看板GMAT
标题[语文] 费费逻辑no.94
时间Sun Aug 24 16:56:30 2008
94. When 100 people who have not used cocaine are tested for cocaine use, on
average only 5 will test positive. By contrast, of every 100 people who have
used cocaine 99 will test positive. Thus, when a randomly chosen group of
people is tested for cocaine use,
the vast people is tested for cocaine use,
the vast majority of those who test positive will be people who have used
cocaine.
A reasoning error in the argument is that the argument
(A) attempts to infer a value judgement from purely factual premises
(B) attributes to every member of the population the properties of the
average member of the population
(C) fails to take into account what proportion of the population have used
cocaine
(D) ignores the fact that some cocaine users do not test positive
(E) advocates testing people for cocaine use when there is no reason to
suspect that they have used cocaine
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我知道GMAT很喜欢考百分比跟实际value之间的关系还有类比
但是这一题的绿色部分我就是看不大懂(汗)
此外，这样的话的答案应该是(A)对吗?
希望有版友能够帮我给我一些意见
谢谢!!!
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1F：推 flac:A应该是说该argument隐含着价值判断 应该不是A才对 08/24 22:08
2F：→ flac:我认为答案可能是C 因为他所得的结果不能去延伸推断全部人口 08/24 22:09
3F：→ flac:有多少比例吸食古柯硷 除非这实验有针对不同人口统计变数 08/24 22:09
4F：→ flac:进行全面性地随机抽样 08/24 22:10
5F：→ pennymany:感谢楼上的详细解答!答案是(C)~谢谢 :) 08/25 18:50