OG12 78题分析欢迎NN拍砖

eleven8310 · 发表于 2012-11-18 10:50:07

深深体会CR需要自己主动分析，开动脑筋，于是第三次按照自己的分类刷OG12。碰到78题，还是纠结于是彻底分析了一次，欢迎指导！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?

A: Drivers who equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers who do not.
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.
C: The number of vehicles that were ticketed for exceeding the speed limit was greater than the number of vehicles that were equipped with radar detectors.
D: Many of the vehicles that were ticketed for exceeding the speed limit were ticketed more than once in the time period covered by the report.
E: Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.
分析：3%装备得到33%超速罚单，结论是装备了更容易收到超速罚单。这里的gap是没有直接说超速概率。
原来的思路一（较复杂）：比例的巨大差距来源于三个层次，高速行车频率（可能装备的车开的更频繁）、超速概率、超速拿到罚单的概率（比较偏激，超速不一定会有罚单）。
以此来看选项：
A-装备超速拿到罚单的概率较小，但是没有说明行车频率，所以不完整；
C-收到罚单车的数量超过装备车，无关；
D-装备车很多不止一张罚单，这是一个前提，但是行车频率、罚单概率均无介绍；且可以通过举例排除，100辆车，3个装备，一张罚单-33%（共3张罚单）。
E-无关；
现在的思路二：已经有一条逻辑链：装备了更容易收到超速罚单，能不能证明更多超速罚单=更大超速概率，即可得装备了更容易超速。如此可以发现B选项正确。

zxppx · 发表于 2012-11-18 16:35:35

我是这样分析的：
题目中的33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them.和B选项中的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.这两部分是相互对应的，而与结论中的drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.也是对应的。填补了GAP：谁are more likely to exceed the speed limit regularly.

我自己举了一个类似的例子，方便理解：
3%的飞机有双涡轮发动机。在因耗油量大而失去动力的飞机中，有33%的飞机装有双涡轮发动机。因此，装有双涡轮发动机的飞机比没有装的飞机更容易失去动力。
Q：假设
A：因为耗油量大而失去动力的飞机比没有耗油量大的飞机更加容易失去动力。
注意：假设中的“因为耗油量大而失去动力的飞机”其实就是指了原文中的装有双涡轮发动机的飞机，然后运用到结论里面！

vilawe · 发表于 2013-1-17 16:36:45

我是这样分析的：
题目中的33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them.和B选项中的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.这两部分是相互对应的，而与结论中的drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.也是对应的。填补了GAP：谁are more likely to exceed the speed limit regularly.

我自己举了一个类似的例子，方便理解：
3%的飞机有双涡轮发动机。在因耗油量大而失去动力的飞机中，有33%的飞机装有双涡轮发动机。因此，装有双涡轮发动机的飞机比没有装的飞机更容易失去动力。
Q：假设
A：因为耗油量大而失去动力的飞机比没有耗油量大的飞机更加容易失去动力。
注意：假设中的“因为耗油量大而失去动力的飞机”其实就是指了原文中的装有双涡轮发动机的飞机，然后运用到结论里面！

-- by 会员 zxppx (2012/11/18 16:35:35)

我觉得这个分析是我看到的最清晰明了的~

aliceloo · 发表于 2013-1-25 16:08:17

cindy2008 · 发表于 2013-2-3 23:34:49

Thx! Very clear

Hendy · 发表于 2014-12-26 18:53:54

P：有罚单的车装了 radar
C：装radar更容易超速；

Assumption:有罚单的更容易超速。

本贴相关题目 OG-2015-CR-77 | GMATPrep-2007E2-CR-40OG-2015-CR-77 |
OG-13-CR-77 |
OG-12-CR-78 |
GMATPrep-2007E2-CR-40
... (KLMT)

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OG12 78题分析欢迎NN拍砖

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本贴相关题目 OG-2015-CR-77 | GMATPrep-2007E2-CR-40OG-2015-CR-77 | OG-13-CR-77 | OG-12-CR-78 | GMATPrep-2007E2-CR-40 ... (KLMT)

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OG12 78题分析 欢迎NN拍砖

所属分类: GMAT考试

正在浏览此版块的会员 ()

本贴相关题目 OG-2015-CR-77 | GMATPrep-2007E2-CR-40OG-2015-CR-77 |
OG-13-CR-77 |
OG-12-CR-78 |
GMATPrep-2007E2-CR-40
... (KLMT)

OG12 78题分析欢迎NN拍砖