求解一道assumption题

xieguodong · 发表于 2011-5-3 11:01:07

正纠结于B/C之间
The U.S. census is not perfect: thousands of Americans probably go uncounted. However, the basic statistical portrait of the nation painted by the census is accurate. Certainly some of the poor go uncounted, particularly the homeless; but some of the rich go uncounted as well, because they are often abroad or traveling between one residence and another.
Which of the following is an assumption on which the argument above depends?
(A) Both the rich and the poor have personal and economic reasons to avoid being counted by the census.
(B) All Americans may reasonably be classified as either poor or rich.
(C) The percentage of poor Americans uncounted by the census is close to the percentage of rich Americans uncounted.
(D) The number of homeless Americans is approximately equal to the number of rich Americans.
(E) The primary purpose of the census is to analyze the economic status of the American population.

cdwayne · 发表于 2011-5-3 11:07:33

(C) 我猜他是指窮人和富人相抵消不影響統計結果, ex, 1,2,3,4,5的平均數等於2,3,4的平均數的概念

xieguodong · 发表于 2011-5-3 11:23:15

但答案是B哦，我个人觉得C貌似也可以。比如原来有8个穷人，2个富人。8：2＝4：1。其中有4个穷人uncounted ,1个富人uncounted。结果还是4：1. 穷人未统计占比例是4：8＝1：2 等于富人未统计占比例1：2 。不知道有没理解错。。

sdcar2010 · 发表于 2011-5-3 11:34:03

Necessary assumption. Use negation.

C is the right answer. If you negate C, then the basic statistical portrait of the nation painted by the census is NOT accurate since the missing poor and missing rich would distort the data.

cdwayne · 发表于 2011-5-3 11:38:09

B？抱歉那我不知道怎麼解，請高人現身吧，census和財富分配有關嗎?

xieguodong · 发表于 2011-5-3 12:45:53

我貌似有点知道了。如果用取非削弱的方法来验证。取非B，直接就削弱了数据的真实性，因为如果存在中产阶级，就是存在穷人和富人以外的人，那么就和reasoning的后半部分不符。因为reasoning就是认定了只存在穷人和富人。而C，The percentage of poor Americans uncounted by the census 和percentage of rich Americans uncounted.
应该是指未统计的穷人占原总人口的比例，按照我之前的举例就应该是4：10 ，富人是1：10 . 不知理解对否。

wynyy2000 · 发表于 2011-5-3 13:47:23

个人愚见：
条件：因为没有统计的的富人和没有统计的穷人一样
结论：人口普查还是准确的
Asssumption1: 一般我们都会想到的，只有在unconnected rich 的人数和 unconnected poor一样多时，人口普查才可能accurate, 但C选项是说的percentage一样，犯了ETS最喜欢的陷阱，percentage 不等于absolute number
Assumption 2: 可能刚开始不容易想到，那就是美国只将人分为rich and poor, 如果还出现一个middle class的话，即便富人，穷人都调查到了，但middle class 没有准确，结论也还是不成立（B项正好符合）

白衣卿相 · 发表于 2011-5-3 19:58:43

个人想法：
原文一开始说了对于 all American 的 census，然后又说了 the poo r以及 the rich，好像有个GAP，需要用 assumption 来弥补这个gap。B 选项“All Americans may reasonably be classified as either poor or rich.” 正好可以弥补这个gap，链接原文argument中的新旧元素“all American” “the poor” “the rich”.
不知道这样想合不合逻辑.....

jaze · 发表于 2011-5-3 20:38:40

个人想法：
原文一开始说了对于 all American 的 census，然后又说了 the poo r以及 the rich，好像有个GAP，需要用 assumption 来弥补这个gap。B 选项“All Americans may reasonably be classified as either poor or rich.” 正好可以弥补这个gap，链接原文argument中的新旧元素“all American” “the poor” “the rich”.
不知道这样想合不合逻辑.....

-- by 会员白衣卿相 (2011/5/3 19:58:43)

没有说 all American 的census吧，是说美国的 census吧，个人理解啊，俺逻辑很烂的

sdcar2010 · 发表于 2011-5-4 07:30:28

Wake up guys. Choice C is the answer. In statistics, only RELATIVE percentage matters. Not the numbers.

If B is the assumption, this question is a JOKE.

求解一道assumption题

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