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A recent report determined that although only three percent

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A recent report determined that although only three percent [#permalink] New post 01 Jul 2003, 06:02
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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.
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 [#permalink] New post 01 Sep 2004, 10:38
SigEpUCI, nice explanation dear
We can look at this too:
http://www.gmatclub.com/phpbb/viewtopic ... t=maryland

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A recent report determined that although only three percent [#permalink] New post 14 Mar 2005, 23:06
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.
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 [#permalink] New post 15 Mar 2005, 00:10
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A recent report determined that although only three percent [#permalink] New post 06 Aug 2005, 04:36
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.

Please, provide explanations.

OA is a few posts below.

Source – GMATPrep by Pearson VUE

Last edited by Pauline on 06 Aug 2005, 23:23, edited 1 time in total.
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 [#permalink] New post 06 Aug 2005, 18:32
B

From
A recent report determined that although only three percent of drivers
...

to the more general conclusion that: Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed ...

We need to assume that the reported case is happening on a regular basis.

Hence
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.
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A recent report determined that although only 3% of drivers [#permalink] New post 14 Sep 2005, 09:49
A recent report determined that although only 3% of drivers on maryland highways equipped their vehicles with radar detectors, 33% 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 rdar 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 exceded teh speed limit more often than did drivers on other state highways not covered in the report.

Pls share us your answer and explanation. Thanks.
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 [#permalink] New post 14 Sep 2005, 10:57
B it is, if B is false, then people who exceed speed limit regularly may not get ticket and somebody who exceed speed limit only once gets caught unfortunately, then the argument falls apart.
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 [#permalink] New post 15 Sep 2005, 10:13
The OA is B.

Here is the official explanation.

The conclusion concerns regularly exceeding the speed limit, but the data derive from isolated occasions when drivers exceed the speed limit and are ticketed. The conclusion thus assumes that these instances provice evidence of regular behavior - that drivers ticketed for exceeding the speed limit are likely to be drivers who regularly exceed it. Choice B states this assumption and is the best answer.

Choices A, C, and D provide additional data that might be relevant to the conclusion, but if Choice B is assumed, then additional data are unnecessary for drawing the conclusion. The difference that choice E describes between Maryland and other states would simply suggest that the report's findings cannot be extrapolated to other states. Id does not help in drawing the conclusion.

What I just don't get is the bold line in the explanation. Can someone help me out here?
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A recent report determined that although only 3% of drivers [#permalink] New post 15 Sep 2005, 10:13
This topic have been merged with: http://gmatclub.com/forum/topic-1378.html
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A recent report determined that although only three percent [#permalink] New post 14 Feb 2006, 14:52
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.
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Re: CR: Drivers [#permalink] New post 14 Feb 2006, 18:07
though i am little confused, go with D.

(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.
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 [#permalink] New post 16 Feb 2006, 17:15
The conclusion concerns regularly exceeding the speed limit, but the data derive from isolated occasions when drivers exceed the speed limit and are ticketed. The conclusion thus assumes that these instances provide evidence of regular behavior-that drivers ticketed for exceeding the speed limit are likely to be drivers who regularly exceed it. Choice B states this assumption and is the best answer. Choices A, C, and D provide additional data that might be relevant to the conclusion, but if choice B is assumed, the additional data are unnecessary for drawing the conclusion. The difference that choice E describes between Maryland and other states would simply suggest that the report’s findings cannot be extrapolated to other states. It does not help in drawing the conclusion.
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A recent report determined that although only 3 percent of [#permalink] New post 28 Mar 2006, 17:30
A recent report determined that although only 3 percent of drivers on Maryland highways equipped their vehicles with radar detectors, 33 perent of all vehicles ticketed for exceeding they 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 seed 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 limited were ticketed more than once in the time period vovered 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.
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 [#permalink] New post 29 Mar 2006, 18:52
Im going with A.

The conlcusion to the argument is

"drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not."

This relies on the inference that radar detectors would decrease your chances of being caught for speeding.

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.

whats the OA ?
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ticketing [#permalink] New post 23 May 2006, 07:45
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.


You might be familar with this question, but I got a wrong answer on this..

Anybody, some help, pls?~

I will put the OA after seeing some discussion over the answers... Thanks in advance.
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 [#permalink] New post 23 May 2006, 08:26
I also got confuse with this. But this is what I have reasoned.

Suppose there are a total of 100 vehicles.
Only 3 had radars. But 33 were caught. so that means it was these people who got caught more than once.

But the author assumes that it will be these same people who will get caught in future also.

As for other choices, they can be eliminated.

(A) Drivers who equip their vehicles with radar detectors are less likely to be ticketed for - this goes against
exceeding the speed limit than are drivers who do not.
(C) The number of vehicles that were ticketed for exceeding the speed limit was greater - this does not matter.
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. - obvious. nothing to assume
(E) Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.
- out of scope. Why should other drivers come into picture
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 [#permalink] New post 23 May 2006, 08:36
I would go with D



(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. [i]-->Likelyhood of ticketing is not discussed[/i]

(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[i].--If true the conclusion would mean that both types (w and w/o radars) were more likely to exceed the speed limit.[/i]

(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. [i]--Number of vehicles is out of scope[/i]

(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. --
[i]"Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than.." To make this claim they would have been ticketed more than once[/i]


(E) Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report. [i]--Out of scope[/i]
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 [#permalink] New post 23 May 2006, 08:58
OK, with an assumption type problem we are looking for an answer that the conclusion would fall apart without.

The conclusion is: "drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not."

Which answers support this conclusion directly?

(A) - no, contradicts.
(B) - yes, supports.
(C) - no, weakens.
(D) - no, it's a true statement but does not give any support to the conclusion.
(E) - no, other states are irrelevant.

I'll go with B. Even though B is seemingly obvious, without B the conclusion is weakened. The other answers don't add to or support the conclusion.

--Matt
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 [#permalink] New post 23 May 2006, 09:41
remgeo wrote:
I also got confuse with this. But this is what I have reasoned.

Suppose there are a total of 100 vehicles.
Only 3 had radars. But 33 were caught. so that means it was these people who got caught more than once.

But the author assumes that it will be these same people who will get caught in future also.

As for other choices, they can be eliminated.

(A) Drivers who equip their vehicles with radar detectors are less likely to be ticketed for - this goes against
exceeding the speed limit than are drivers who do not.
(C) The number of vehicles that were ticketed for exceeding the speed limit was greater - this does not matter.
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. - obvious. nothing to assume
(E) Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.
- out of scope. Why should other drivers come into picture


Let me throw a spanner in the works. What about the case when only 3 people are caught speeding? This means only 1 person with the radar was caught, and obviously he wasn't caaught twice. Same is true forthe case when 6 drivers were caught speeding. Hope you et the drift - the question is "33% of all the drivers caught" and not "33% of the population or all the cars".

Last edited by alfa_beta01 on 23 May 2006, 09:47, edited 1 time in total.
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 [#permalink] New post 23 May 2006, 09:46
I vote "B".

"B" states that "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."

And the concluson is: "Drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than
are drivers who do not."

Thus, the author assumes that the people who are caught (the ones with detector), are more likely to speed.
  [#permalink] 23 May 2006, 09:46
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