OG12 78题

leci

Q78.

A recent report determined that although only 3 percent of drivers on Maryland highways equipment 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 detecters are more likely to exceed the speed limit regularly than are drivers who do not.

the conclusion drawn above depends on which of the assumotions?

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 likely to exceed the speed limit reguarly 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 vehicels that were ticketed for exceeding the speed limit wre located more than once in the time period covered by the report.
E Drivers on Maryland highways exceeded the speed limit more often than diDd drivers on other state highways not covered in the report

这个题我开始想不明白，也看了很久别人的解释，最后是被有位同学的“regularly”给开了窍
也说说我自己开窍的想法。简言之：

既然highway“高速情况”不能代表regularly“一般情况”，如何让“高速情况”能代表“一般情况”？就是我们找assumption的

依据。那么就是B选项的挨罚的人一般比不挨罚的人更容易超速（真理，适用于高速，也适用于一般）。

我觉得，跟装不装“雷达”一点关系都没有，装什么都成。你把“装雷达的车”换成“红色的车”神马的，也是一样。这样的话，选项中跟雷达有关的ABC首先就能排除了。

kaminagi

总人群中 罚单者 3%
雷达者中 罚单者 33%

Therefore 雷达者中罚单比例更高

雷达者中超速者比例更高

罚单=超速

alancui

IMO, "regularly" is the key point, as actually it's the gap between premises and conclusion.

3% drivers equipped with radar   ---- P1
33% ticked equipped radar ----P2
equipped with radar are more likely to exceed the speed regularly ---- C


P1 and P2 => equipped with radar are more likely to exceed the speed.   ---- R1


Comparing R1 with C, we can find "regularly" is the gap.   Then, we can cross out A, C, and D directly.

doudouwei128

第三遍OG到这题又卡了，看了各版解释我想说一下我思考的结果，提干中的3%和33%有一点暗含比较。因为3%的人装radar,如果正常情况按此概率被罚的人里应该也有3%装radar才对，可结果却是33%，这就说明装了radar更易被罚一些，而结论却是装了radar更易超速，所以答案要在被罚和超速间搭桥，即装radar易被罚，被罚易超速，则装radar易超速。

弗拉多

同意！！regularly让我豁然开朗！！

jiaying52

这个帖子也有讨论
http://forum.chasedream.com/GMAT_CR/thread-463668-1-1.html

谢谢3.4楼的解释，我一直觉得regularly多少有点与题目相关（如上面帖子所讨论的），莫不是被误导了 囧oz~

-- by 会员 ak007 (2011/4/5 15:08:35)

强烈同意和regularly有关系！

jiaying52

Q78.

A recent report determined that although only 3 percent of drivers on Maryland highways equipment 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 detecters are more likely to exceed the speed limit regularly than are drivers who do not.

the conclusion drawn above depends on which of the assumotions?

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 likely to exceed the speed limit reguarly 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 vehicels that were ticketed for exceeding the speed limit wre located more than once in the time period covered by the report.
E Drivers on Maryland highways exceeded the speed limit more often than diDd drivers on other state highways not covered in the report

这个题我开始想不明白，也看了很久别人的解释，最后是被有位同学的“regularly”给开了窍
也说说我自己开窍的想法。简言之：

既然highway“高速情况”不能代表regularly“一般情况”，如何让“高速情况”能代表“一般情况”？就是我们找assumption的

依据。那么就是B选项的挨罚的人一般比不挨罚的人更容易超速（真理，适用于高速，也适用于一般）。

我觉得，跟装不装“雷达”一点关系都没有，装什么都成。你把“装雷达的车”换成“红色的车”神马的，也是一样。这样的话，选项中跟雷达有关的ABC首先就能排除了。

-- by 会员 leci (2011/4/4 20:52:26)

其他的帖子都没觉得没有彻底说法我，看到lz的帖子，又看了og上的解释，强烈同意LZ关于regularly这个小词的说法，（不过不是和highway做比较，而是发生ticket的频率）OG12后面的解释说
The argument moves from a particular example, that is, the percentage of vehicles ticketed for exceeding the speed limit that were equipped with radar detectors, to a generalization about the regular driving behaviors of all drivers who have radar detectors in their vehicles.The reasoning links the example to the generalization with an assumption. What can the assumption be? Only if the drivers ticketed in this instance are assumed to make a regular habitof exceeding the speed limit can the conclusion be drawn that drivers with radar detectors are more likely to do so regularly than drivers who are not ticketed.

貌似结论和前提的鸿沟是要把一个发生一次的例子，变成经常发生的事情。
Open to discuss!

ak007

这个帖子也有讨论
http://forum.chasedream.com/GMAT_CR/thread-463668-1-1.html

谢谢3.4楼的解释，我一直觉得regularly多少有点与题目相关（如上面帖子所讨论的），莫不是被误导了 囧oz~

leci

谢谢各位。的确，power和gaga的是正解。
reguarly那个解释，是在脑子被绕晕的情况下生造出来的野路子。（虽然也说不定对解题有帮助）

gaga110

Q78.

A recent report determined that although only 3 percent of drivers on Maryland highways equipment 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 detecters are more likely to exceed the speed limit regularly than are drivers who do not.

the conclusion drawn above depends on which of the assumotions?

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 likely to exceed the speed limit reguarly 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 vehicels that were ticketed for exceeding the speed limit wre located more than once in the time period covered by the report.
E Drivers on Maryland highways exceeded the speed limit more often than diDd drivers on other state highways not covered in the report

这个题我开始想不明白，也看了很久别人的解释，最后是被有位同学的“regularly”给开了窍
也说说我自己开窍的想法。简言之：

既然highway“高速情况”不能代表regularly“一般情况”，如何让“高速情况”能代表“一般情况”？就是我们找assumption的

依据。那么就是B选项的挨罚的人一般比不挨罚的人更容易超速（真理，适用于高速，也适用于一般）。

我觉得，跟装不装“雷达”一点关系都没有，装什么都成。你把“装雷达的车”换成“红色的车”神马的，也是一样。这样的话，选项中跟雷达有关的ABC首先就能排除了。

-- by 会员 leci (2011/4/4 20:52:26)

A recent report determined that although only 3 percent of drivers on Maryland highways equipment 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 detecters are more likely to exceed the speed limit regularly than are drivers who do not.

the conclusion drawn above depends on which of the assumotions?

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 likely to exceed the speed limit reguarly 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 vehicels that were ticketed for exceeding the speed limit wre located more than once in the time period covered by the report.
E Drivers on Maryland highways exceeded the speed limit more often than diDd drivers on other state highways not covered in the report

个人见解 嘿嘿嘿
直接前提 ：安装radar的占超速罚款的33%
结论：安装radar更容易超速
假设是把有差异的概念联系起来  所以 超速罚款的更容易超速

其实这样简化了很多信息
最好的办法画圈圈   用图仔细研究一下就出来了