【诚心求助】陷入一个小时无解：OG11-81

vivienjin · 发表于 2009-11-13 04:17:41

琢磨了一个小时完全没有头绪，感觉进到思维死角，绝望，恳请NN拔刀相助！

A recent report determined that although only 3 percent of drivers on Maryland 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?

Answer: 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.

答案是在补充gap么？对于这种percentage 的题目应该如何理解？非常非常感谢！

TheAssembly · 发表于 2009-11-13 20:23:04

注意两个概念差别
TICKETED FOR EXCEEDING THE SPEED LIMIT（因超速被罚款）和 “REGULARLY” EXCEED THE SPEED LIMIT（经常超速）是有区别的
按照题干 3%的人装雷达，超速被罚款的人里33%的人装雷达，只能推出“装雷达”的更可能“超速被罚款”（因为33%/3% > 67%/97%），要推出“装雷达”更可能“经常超速”，只能是“超速被罚款”的更可能“经常超速”，才能把断掉的推理连接起来。
考的就是差异概念，虽然很SB，但得搞清楚才行

genius_fang · 发表于 2009-11-13 21:47:39

呵呵，楼上说的很清楚！这道题目我刚开始也搞错了~关键看清楚结论！结论是：装了雷达更容易超速。

0o小猪o0 · 发表于 2009-11-14 21:52:40

一开始我也搞错了的说看了2楼的解释彻底明白啦！

vivienjin · 发表于 2009-11-17 03:27:46

非常感谢Assembly，醍醐灌顶啊！原来玄机在此啊，真高！多谢多谢！

yangshaofei · 发表于 2010-10-24 16:58:11

感谢 “TheAssembly” ！

AustinLuan · 发表于 2013-8-28 09:42:14

谢二楼指点！

小蜗xw · 发表于 2016-7-13 15:14:09

谢二楼大神

ysggsy · 发表于 2017-4-30 22:48:41

TheAssembly 发表于 2009-11-13 20:23
注意两个概念差别TICKETED FOR EXCEEDING THE SPEED LIMIT（因超速被罚款）和 “REGULARLY” EXCEED THE S ...

谢大神指点！

fearlesssssss · 发表于 2019-10-29 15:24:33

楼上说的醍醐灌顶绝对形容到位，2楼解释得太好！

【诚心求助】陷入一个小时无解：OG11-81

醍醐灌顶，太感谢了！

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