OG 78题的答案不是很明白，求解释

garlicwu · 发表于 2011-6-29 16:31:22

78. A recent report determined that although only 3 percent of drivers on Maryland highways equipped their vehicles with radar detectors, 33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them. Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.

The conclusion drawn above depends on which of the following assumptions?

Correct：
(B) Drivers who are ticketed for exceeding the speed limit are more likely to exceed the speed limit regularly
than are drivers who are not ticketed.

感觉这是个事实呀，“得到罚单的比没有得到罚单的更有可能超速”，怎么OG说它是assumption？

sdcar2010 · 发表于 2011-6-30 00:09:03

If this is a fact, it HAS to be stated explicitly in the passage. So it is not a fact.

garlicwu · 发表于 2011-6-30 00:33:48

If this is a fact, it HAS to be stated explicitly in the passage. So it is not a fact.

-- by 会员 sdcar2010 (2011/6/30 0:09:03)

多谢指导，
不知是我思维没转过来还是钻牛角尖了，我一直没理解这个逻辑上的先后关系，这个assumption是建立在罚单已经开出的基础上的，如果还没有开罚单，这个assumption就没有根据，就无 likely 可言。
1. 开罚单前：我假设“将来被开罚单的人”比“将来没有被开罚单的人”更有可能超速。这还用假设吗
2. 开罚单后：假设A被开了罚单，B没有，那现在罚单已经开出了，再假设“开罚单之前，A比B more likely 超速”，又有点马后炮的感觉

我是不是思维没跟上GMAT的思维呀？
抑或是简单化处理：原文没有 explicitly 提到的，都当 assumption 论。

sdcar2010 · 发表于 2011-6-30 01:50:51

If you read the following posts, you might be able to understand this question better:

http://forum.chasedream.com/GMAT_CR/thread-563491-1-1.html

http://forum.chasedream.com/GMAT_CR/thread-564066-1-1.html

http://forum.chasedream.com/GMAT_CR/thread-569879-1-1.html

garlicwu · 发表于 2011-6-30 15:05:31

"An assumption is an unstated premise. In other words, an assumption is a piece of evidence that strengthens the author’s argument but that the author never sates explicitly in the stimulus."

I got, thanks a lot.

OG 78题的答案不是很明白，求解释

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