OG12 - 78 关于OG的解释

斗戰士のNGU

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 ticketed 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

属于填补Gap题，我理解。 但是OG关于D的解释我不是很明白

D. While this additional information could help support the conlcusion, it is not a necessary assumption in the conclusion because it is about the particular example of the drivers in Maryland, not about drivers' habits in GENERAL

为什么唯独这个选项给出了具体地域和GENERAL的解释？ 不明白，其他选项也没有特别声明是只针对Maryland的啊

sdcar2010

No. What's wrong with D is the word "many." Many could be one ONLY. "particular example."

superjustin

Sorry, I couldn't completely agree.

superjustin

Let's talk about how we can most efficiently resolve this issue.
As I learn from sdcar2010's "Logic Entry", such type of question as necessary assumption(the conclusion depends on which of the following assumptions) should be resolved by NEGATING last two choices, which are B and D. Then neither "not B" nor "not D" can weaken the conclusion that drivers with radar more likely exceed speed limit than drivers without radar.
So I have to resort to my common sense and unfortuantly think D is more logical.

Dear sdcar2010, please kindly instruct me, perhaps it's also typical problem faced by other G mates.
thanks so much in advance.

sdcar2010

If you negate (B), you have:
Drivers who are ticketed for exceeding the speed limit are NOT more likely to exceed the speed limit regularly than are drivers who are not ticketed.
If that is the case, then for those drivers who have radar detectors and who got a speeding ticket, they are NOT more likely to exceed the speed limit regularly than are drivers who are not ticketed. This is in contrary to the conclusion of the stimulus -- Drivers who equip their vehicles with radar detectors ARE more likely to exceed the speed limit regularly than are driver who do not. So if you negate (B), the stimulus falls apart. Thus, (B) is the correct answer.

Let's talk about how we can most efficiently resolve this issue.
As I learn from sdcar2010's "Logic Entry", such type of question as necessary assumption(the conclusion depends on which of the following assumptions) should be resolved by NEGATING last two choices, which are B and D. Then neither "not B" nor "not D" can weaken the conclusion that drivers with radar more likely exceed speed limit than drivers without radar.
So I have to resort to my common sense and unfortuantly think D is more logical.

Dear sdcar2010, please kindly instruct me, perhaps it's also typical problem faced by other G mates.
thanks so much in advance.

-- by 会员 superjustin (2012/1/8 14:04:27)

斗戰士のNGU

虽然没有解决我的疑惑，但是原来many could be one only. 还是谢谢2位NN

superjustin

thanks sdcar: So if you negate (B), the stimulus falls apart. Thus, (B) is the correct answer.

versus my understanding: This is in contrary to the conclusion of the stimulus .
OK, now I understand such necessary assumption can also be valid while undermining stimulus, not always conclusion!

Now I got it, thanks sdcar again.

xinnono

不知道大家是不是没看懂题...

如果D正确, 就意味着, 作者认为很多装雷达的人在report期间至少被开过2次罚单. 错是错在这里了啊.... 这个不是作者的本意. OG解释也是说, 如果他们被至少开过2次罚单或是更多, 可以帮助解释, 但是这并不一定necessary.

it's not about the word "many", but about "more than once"... 亲们~

patrizioren

B:逻辑方向为vehicles ticketed                       =>   more likely to exceed regularly
D:逻辑方向为many of the vehicles ticketed   =>   exceed more than once during the report time

箭头之前：many of the vehicles = not all vehicles; BUT, vehicles ticketed其实等同于all vehicles ticketed
箭头之后：exceed more than once during the period of the report 也不等同与 more likely to exceed regularly  

综上，不论是箭头之前还是箭头之后的内容，D和B相比均存在偏差