ChaseDream

标题: gwd 9 13 [打印本页]

作者: Kath1985 时间: 2011-5-25 21:45
标题: gwd 9 13
15. GWD-18-Q15
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

是E
請問: 1我選C 思維是這樣的題目說有A又有H的人超過95% 為什麼不能反推回去沒A又沒H的人少於5%呢?
2 D選項錯在哪呢?
3 E選項畫成偉恩圖是這樣嗎? 但畫了卻看不出來如E說的"有H又有A的人少於95%呀"
要怎樣畫表達E的偉恩圖呢
[attachimg=336,299]87124[/attachimg]

作者: 坤kun 时间: 2011-5-25 23:56

15. GWD-18-Q15
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

是E
請問: 1我選C 思維是這樣的題目說有A又有H的人超過95% 為什麼不能反推回去沒A又沒H的人少於5%呢?
2 D選項錯在哪呢?
3 E選項畫成偉恩圖是這樣嗎? 但畫了卻看不出來如E說的"有H又有A的人少於95%呀"
要怎樣畫表達E的偉恩圖呢
87124

-- by 会员 Kath1985 (2011/5/25 21:45:33)

LZ仔细看一下题~我觉得这道题的关键在于题目的表述~
Over 95 percent of people who have asthma also suffer from hay fever。指的是得A的人中，有95%也有F
而E选项：The percentage of people suffering from hay fever who also have asthma is lower than 95 percent。说的是得F的人中，同时也得A的少于95%。
所以LZ不能直接说有F又有A的人，因为范围是不同的~
那这几个选项应该就很容易理解了~
我就解释下E，题目已经说明A没有F常见，从你自己画的那个韦恩图上也已经很明显用大、小圆区分了，重叠部分占小圆的95%，肯定就不到大圆的95%啦~
其他几个选项LZ试着自己推一下~

作者: sdcar2010 时间: 2011-5-26 00:44
This is a must-be-true question: inference.

Only E is true becasuse A is less common than HF. Therefore the total number of people who have HF is bigger than that of who have A. Then it is a simple math problem to calculate the percentages for comparison.

Two hundred people have hay fever. One hundred people have asthma. Out of the 100 people who have asthma, 95 of them have hay fever, in other words, 95% of the people who have asthma also have hay fever.

Then out of the 200 people who have hay fever, again 95 of them have asthma. Translation: only 47.5% of the people who have hay fever also have asthma.

Simple math.

欢迎光临 ChaseDream (https://forum.chasedream.com/)

Powered by Discuz! X3.3