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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)

00:00:00

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?

ADrivers who equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers who do not.
BDrivers who are ticketed for exceeding the speed limit are more likely to exceed the speed limit regularly than are drivers who are not ticketed.
CThe number of vehicles that were ticketed for exceeding the speed limit was greater than the number of vehicles that were equipped with radar detectors.
DMany of the vehicles that were ticketed for exceeding the speed limit were ticketed more than once in the time period covered by the report.
EDrivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.

正确答案: B

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楼主

发表于 2013-6-24 11:10:05 | 显示全部楼层

1.全体司机的3%装雷达探测
2.超速被罚的车里有33%装了雷达探测
结论是装了雷达探测的司机更容易超速。
2讲的是超速被罚，结论讲的是超速，所以B选项把超速被罚和超速联系起来，作为假设支持。

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同意！

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沙发

发表于 2013-6-24 13:51:33 | 显示全部楼层

yjylww 发表于 2013-6-24 12:03
我看到2的第一反应就是那剩下的67%都是没装雷达的，所以觉得这个结论根本就成立不了。。。 ...

剩余67%的确都没装雷达探测，但装的占总量只有3%，不装的97%，从概率上来讲，装的和不装是否被罚款比例为33/3：67/97，显然装的被罚的概率高。所以只要把被罚和超速联系起来就行。

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