ChaseDream
搜索
返回列表 发新帖
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?

正确答案: B

相关帖子

更多...

更多相关帖子

524

帖子

15

好友

4712

积分

ChaseDream

注册时间
2003-03-17
精华
8
解析
查看: 3164|回复: 2
打印 上一主题 下一主题

再问一道逻辑题。。

[复制链接]
跳转到指定楼层
楼主
发表于 2010-2-27 17:49:58 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
prep logic 40题请教                                                                
                   A recent report determined that although only three percent of drivers on Maryland highways equipped their vehicles with radar detectors, thirty-three 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.
请问这题为什么选B呢?谢谢
收藏收藏 收藏收藏
沙发
发表于 2010-2-27 18:20:45 | 只看该作者
事实,3%的司机在车上装了雷达探测器。33%的超速且被开了罚单的车装有雷达探测器。
结论,装雷达探测器的车更有可能超速比没有装的车。

注意特殊性,前提和结论讨论的对象不同。前提说的33%是讲被开了罚单的超速司机,但结论变成了说超速的司机。这就是subtle shift。有漏洞,比如可能没装雷达的车虽然经常超速,但是很少被抓住。

A.直接对结论取非。不符合not-weaken。排除。
B.弥补了推理中的断桥。
C.无关。注意这个讲的是绝对数,the number和推理中讲的percentage没有关系。排除。
D.有点迷惑,其实还是无关。只讲到被开罚单的司机,和结论中超速的司机无关。
E.无关。
板凳
 楼主| 发表于 2010-2-27 19:21:26 | 只看该作者

谢谢!

您需要登录后才可以回帖 登录 | 立即注册

Mark一下! 看一下! 顶楼主! 感谢分享! 快速回复:

手机版|ChaseDream|GMT+8, 2024-11-22 09:09
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号

ChaseDream 论坛

© 2003-2023 ChaseDream.com. All Rights Reserved.

返回顶部