携隐无重复版GWD9-13

myicesky1228 · 发表于 2005-11-21 21:53:00

GWD-9-Q13:

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?

Hay fever is a prerequisite for the development of asthma

Asthma is a prerequisite for the development of hay fever

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

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

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

这道题的答案似乎是选E，就没有搞明白，说是超过95%患A病的人都发烧，E的意思本来就不太明白，我的理解是发烧的人里面同时也患A病的比率小于95%，感觉上推不出来这个结论呢，所以我选的B，请各位NN们帮我解答一下，谢谢

harlequin · 发表于 2005-11-21 22:08:00

偶只是菜鸟，但是偶觉得画一个韦恩图就很明显了。注意：much less common

steveyangxt · 发表于 2005-12-16 19:56:00

前提：哮喘比干草热少见

有哮喘又有干草热的人/哮喘的人数大于等于95%

有干草热又有哮喘的人数/干草热的人数应小于95%

分母增大了嘛

amber0919 · 发表于 2006-5-1 16:12:00

shzzhengfan · 发表于 2006-5-1 16:14:00

啥叫韦恩图啊？

flamedream · 发表于 2007-5-31 16:32:00

much less common ailment

这题的重点在这里

shirley8707 · 发表于 2008-5-11 15:05:00

一定是根据两者的结合，得出must be true 的信息，第一句话得出
            P（a）〈
            P（HF），第二句话
        得出p(a交上hf) =95%p(a),所以=bP(hf), b<95%

周末愉快 · 发表于 2008-5-18 06:42:00

over 95 percent of people who have asthma 和The percentage of people suffering from hay fever 比较的基础是不同的.

前者的PEOPLE只占全部人的一小部分.

后者就多多了.所以占前者95%的占后面的就少多了.

这里要注意比较的对象群是不同的.

yzhao26 · 发表于 2008-6-2 08:17:00

stephenyu · 发表于 2008-6-23 00:57:00