享受生活，享受GMAT-明天该说再见了吧，亲爱的吉迈特mm

yakev6

这题挺好的，我花了3'21''....
关键是most%和30%这两个比例的分子分母都不同，所以不能比较。

尽管分子/分母都是      "age <35"/"any age"
most%的研究范围(scope)是    All of the AD-driven orders
30%的研究范围(scope)是    the AD-driven orders from subscribers
其实就是仔细比较原文的文字，就会发现"by subscribers"是区别。lz说的关注调查对象的思路，也很赞~

占了楼，给CR用。。。
一道逻辑题带来的反思。

12.(25359-!-item-!-188;#058&001894)

Finding of a survey of Systems magazine subscribers:Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine:Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five

For both of the findings to be accurate, which of the following must be true?

(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five.

(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.

(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.

(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine.

针对一件事情的两次survey，得到了两种结果，调查范围的不同导致比例的不同，
针对订阅杂志的人的survey，看到广告消费的人30%为30岁以下。
针对购买者的survey，看到杂志上广告而购买的人大多数为30岁以下的。
推理，有人没买杂志但看到了广告。
这道题的提示是，survey一定要看是其目标人群是谁。错误的目标人群将会得到错误的调查结果。

99593

-- by 会员 yakev6 (2012/4/25 13:19:36)

-- by 会员 babybearmm (2012/4/27 3:59:16)

bearmm说的好，我做这题也花费了不少时间，而且还错了，所以才贴到这做了个总结。

yakev6

Must Be True问题的反思：
今天中午又看了一遍bible的Must be true这章，bible真是好书，每次看都有很多新的发现。
must be true问题，实际考的是我们的归纳推理能力，认真看完这章我发现这才是critical thinking的基础，什么叫safe inference，怎么样才能valid，虽然在CR中的比重并不大，但是在RC中的main idea，supporting idea, inference题型同样都是Must be true. 记得看RC解释时候，很多错误选项OG都会解释为not mention，not discuss，实际上都是指出非原文信息，不能从文章中safe infer，想到这。。。被打断。。。先去开会，回来再总结。

clover928

Must Be True问题的反思：
今天中午又看了一遍bible的Must be true这章，bible真是好书，每次看都有很多新的发现。
must be true问题，实际考的是我们的归纳推理能力，认真看完这章我发现这才是critical thinking的基础，什么叫safe inference，怎么样才能valid，虽然在CR中的比重并不大，但是在RC中的main idea，supporting idea, inference题型同样都是Must be true. 记得看RC解释时候，很多错误选项OG都会解释为not mention，not discuss，实际上都是指出非原文信息，不能从文章中safe infer，想到这。。。被打断。。。先去开会，回来再总结。

-- by 会员 yakev6 (2012/4/27 15:10:43)

同意~~~~我也爱bible~yake加油~

199249712

大叔。。脱了你的马甲。。。

yakev6

大叔。。脱了你的马甲。。。

-- by 会员 199249712 (2012/4/27 16:29:07)

我在群里都说了。。。以后穿这件衣服了

CCcarol

我要把这个帖给水了~~~

yakev6

我要把这个帖给水了~~~

-- by 会员 CCcarol (2012/4/27 16:34:04)

199249712

换马甲也掩盖不了你大叔的本质

phoebe0624

上邪好厉害啊！嘻嘻！经过你的提点，我也猜到了
居然还有马甲

yakev6

换马甲也掩盖不了你大叔的本质

-- by 会员 199249712 (2012/4/27 16:36:21)

本来就是大叔吗。。。你奈我何