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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]

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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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20 Jul 2016, 14:03
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ashutoshsh wrote:
ywilfred wrote:
3% of drivers on maryland highways equip their vehicles with radar detectors
31% of all vehicles ticketed for exceeding the speed limit were equip with them
Drivers who equip their vehicles with radar detectors are more likely to exceed speed lmiit regularly than driver who do not <-- conclusion

(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.
- does not hold up the conclusion

(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.
This one holds up the conclusion. We're told a large percentage of vehicles with radar detectors were ticketed for speeding. Then (B) says those who are ticketed are likely to exceed the speed limit regularly. So the conclusion that vehicles with radar detectors exceed the speed limit regularly is true.

(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.
- not important.

(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.
- does not help the conclusion

(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

Hey!
Why is option C not important. I agree, the conclusion says that drivers with radar are more likely to exceed speed limit more regularly than drivers who do not. But this conclusion is based on the evidence that only 3% of drivers have radars and 33%of all vehicles ticketed were equipped with radar. From this evidence, the assumed that no. of vehicles that were ticketed for exceeding the speed limit was greater than the n. of vehicles with radar.

Let us analyze the argument using two intersecting sets:
Vs = ticketed vehicles
Vr = vehicles having radar detectors

Vr = 3%
Vr' = 97%

Vr∩Vs = 33% of Vs
Vr'∩Vs = 67% of Vs

We see that although Vr is very small compared to Vr', Vr∩Vs is much larger compared to Vr'∩Vs. Hence it is concluded that Vr vehicles are more likely to exceed speed limits ( i.e., lie within the intersection of the 2 sets) than Vr' vehicles are.

Now, assumption C: Vs>Vr

Negate this: Vs<Vr, and see if the argument breaks down.

Even if Vs<Vr, the above conclusion may still be valid. It does not matter which set is bigger to arrive at the conclusion. (Try drawing various sizes of Vr and Vs yourself; you would then see the concept more clearly)
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01 Sep 2004, 07:06
B.

Only B can be the assumption. All the others does not say how the conclusion - drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not can be arrived.
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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]

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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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15 Mar 2005, 00:10
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A recent report determined that although only three percent [#permalink]

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06 Aug 2005, 04:36
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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.

OA is a few posts below.

Source â€“ GMATPrep by Pearson VUE

Last edited by Pauline on 06 Aug 2005, 23:23, edited 1 time in total.
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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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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.

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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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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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15 Sep 2005, 10:13
This topic have been merged with: http://gmatclub.com/forum/topic-1378.html
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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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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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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 reportâ€™s findings cannot be extrapolated to other states. It does not help in drawing the conclusion.
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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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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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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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23 May 2006, 08:26
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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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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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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?

(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
23 May 2006, 08:58

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