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标题: GWD逻辑一题求解 [打印本页]

作者: carolcai 时间: 2008-5-20 22:01
标题: GWD逻辑一题求解

Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.

Fact: Over 95 percent of people who have asthma also suffer from hay fever.

If the information given as facts above is true, which of the following must also be true?

A. Hay fever is a prerequisite for the development of asthma.

B. Asthma is a prerequisite for the development of hay fever.

C. Those who have neither hay fever nor asthma comprise less than 5 percent of the total population.

D. The number of people who have both of these ailments is greater than the number of people who have only one of them.

E. The percentage of people suffering from hay fever who also have asthma is lower than 95 percent.

Answer: E

怎么都分析都不出头绪，望高人指点。谢先

作者: ad264 时间: 2008-5-21 00:40
fact 1: Asthma < Hay fever
fact 2: 95% Asthma有hay fever

B是说H的先决条件是要得A，但是这个关系本文为提，常出现一个调查结果，选项就设计出一个因果关系，再度复习此题，提醒自己要将之视为无关。

就算是得到H，如果是「一定」要得到A，那怎会出现H>A，应该是H=A才对。

E 想成一个大圈一个小圈，重叠处就是两个病都有的，本文站在A 病人角度出发说重叠处(有A有H)的占95%。选项则是站在H病人角度说重叠处(有A有H)的低於95%。为何会对呢？因为H>A，H的分母比较大，所以他看两个重叠处就显得占的比例小。

Please correct me if I am wrong

作者: carolcai 时间: 2008-5-21 10:20
多谢啊

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