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标题: OG12-78 [打印本页]

作者: 百草花园    时间: 2009-10-26 07:22     标题: OG12-78

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.

答案为B

这道题目看了选项B之后还是不能把这个前提和结论联系起来。平时超速被ticketed的人更容易超速,这个前提和他的结论“装了雷达系统的人更容易超速‘有什么关系亚?谢谢指教了~


作者: 羽依依    时间: 2009-10-26 20:20

给出的支持的例子是被抓住超速的人,而结论是“超速”本身。所以,有个隐含的假设:被抓住的超速的人更容易超速。如果没这个假设,有可能是被抓住超速的人就超速1次就被抓了,而没被抓的人可能超了100次都没被抓。这样结论就得不出来了。
作者: chriswendy36    时间: 2009-10-29 10:50

QUOTE:
以下是引用羽依依在2009-10-26 20:20:00的发言:
给出的支持的例子是被抓住超速的人,而结论是“超速”本身。所以,有个隐含的假设:被抓住的超速的人更容易超速。如果没这个假设,有可能是被抓住超速的人就超速1次就被抓了,而没被抓的人可能超了100次都没被抓。这样结论就得不出来了。

 

agree


作者: 百草花园    时间: 2009-10-29 10:51

QUOTE:
以下是引用羽依依在2009-10-26 20:20:00的发言:
给出的支持的例子是被抓住超速的人,而结论是“超速”本身。所以,有个隐含的假设:被抓住的超速的人更容易超速。如果没这个假设,有可能是被抓住超速的人就超速1次就被抓了,而没被抓的人可能超了100次都没被抓。这样结论就得不出来了。

 

明白了,谢谢指点


作者: 百草花园    时间: 2009-10-30 06:38

我比较迟钝,还是不懂啊~
作者: daoyings    时间: 2009-11-1 06:52

结论和前提之间有一个GAP,就是前提中说的是把33%是ticketed for exceeding the speed limit .而结论直接说的是exceed the speed limit 。assumption 里面补掉gap,ticketed for exceed the speed limit 的人更容易exceed the speed limit .如果不填,前提中只说了那些被ticketd的人装有雷达,有可能是因为装有雷达让他们更容易被发现超速而ticketed,而其他没有装雷达的超速却只是因为没有被tickted,不是因为他们超速的可能性小.
作者: haitai    时间: 2009-11-8 10:16

QUOTE:
以下是引用羽依依在2009-10-26 20:20:00的发言:
给出的支持的例子是被抓住超速的人,而结论是“超速”本身。所以,有个隐含的假设:被抓住的超速的人更容易超速。如果没这个假设,有可能是被抓住超速的人就超速1次就被抓了,而没被抓的人可能超了100次都没被抓。这样结论就得不出来了。

 

great explanation






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