CR求解 source:gmatclub 700-level questions

midsummer1026 · 发表于 2016-3-26 11:05:20

Minorities were five times as likely as non-minorities to be stopped by the police in 1992. Once stopped, however, they were no more likely to actually be arrested. The police have compounded the problem by loading information on these people into its permanent database, which is one of the first stops for investigating actual crimes. Innocent individuals become a permanent focus of the police because of their ethnic background.

Which of the following, if true, most strongly undermines the argument above?

(a) Policed stopped nine times more total people in 1992 than in previous years.
(b) Innocent people listed on the database are highly unlikely to be arrested for actual crimes.
(c) The database has been instrumental in the capture of several important criminals.
(d) The minority population is much larger than the non-minority population.
(e) Not everyone stopped by police is entered into the database.

OA是d 然后我并不知道d有什么关系？？麻烦大神指导

elusive · 发表于 2016-3-26 12:10:00

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elusive · 发表于 2016-3-26 12:18:00

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midsummer1026 · 发表于 2016-3-26 23:47:04

elusive 发表于 2016-3-26 12:18
我再想想

你的无关选项排除和因果关系很好～至少我懂了
我看了下gmatclub上面的解释说d的可能情况是
majority 1 60
minority 1 40
minority 2 40
总之这题出的不太好就是了

elusive · 发表于 2016-3-27 00:53:24

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elusive · 发表于 2016-3-27 01:00:37

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midsummer1026 · 发表于 2016-3-27 01:35:51

elusive 发表于 2016-3-26 12:18
我再想想

btw thx~~~

midsummer1026 · 发表于 2016-3-27 01:46:25

elusive 发表于 2016-3-27 01:00
如果不用相关做，
因果推理：
因为少数民族，虽然是无辜的，更容易被调查

我现在的理解是
果：比起非少数民族少数民族5倍可能被警察怀疑
因：他们的民族背景
要削弱它因少数民族本来就比非少数民族多

elusive · 发表于 2016-3-27 01:59:11

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alzn2765 · 发表于 2016-3-28 22:06:25

midsummer1026 发表于 2016-3-27 01:46
我现在的理解是
果：比起非少数民族少数民族5倍可能被警察怀疑
因：他们的民族背景

这个理解是错的。因为结论是Innocent individuals become a permanent focus of the police because of their ethnic background，而不是Minorities were five times as likely as non-minorities to be stopped by the police in 1992。
所以这一定不可能是一个果因推理。

这题其实是一个统计枚举题。
说Innocent individuals become a permanent focus of the police because of their ethnic background的唯一论结就是Minorities were five times as likely as non-minorities to be stopped by the police in 1992。这本身是一个“数据类”的论据。既然是数据类的，我只要证明data is bias的就可以了：如果本来Minorities在当地就是多数人口呢？那按照概率来说他们被拦下检查的“次数”比Majorities多也不奇怪啊。

CR求解 source:gmatclub 700-level questions

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