feifei 逻辑94 有点难度

girlwithwings · 发表于 2009-12-31 12:34:13

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 judgment 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

答案C

费费详解里我看不太明白。

请大家能否用通俗易懂的方式说明一下。

法兰克福来客 · 发表于 2010-1-1 00:10:58

简单的讲就是测试人群不确定，如果全部都是没有用过可卡因的人参加测试，那么“the vast majority of those who test positive will be people who have used cocaine. ”就不对了，因为根本就没有人用过可卡因

girlwithwings · 发表于 2010-1-4 06:05:42

谢谢你的回复。

主要不太理解以下这句话的机构和意思。能否请你说detail一些。

以下这句话的主语到底是哪个嘞？

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.

hanlei8492 · 发表于 2010-10-10 22:08:48

弱弱的问，选项B是什么意思？

feifei 逻辑94 有点难度

hello

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