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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
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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A recent report determined that although only three percent [#permalink] New post 13 Jan 2008, 10:59
171. 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-please explain this one [#permalink] New post 22 Jan 2008, 20:22
I would go with A. Whats the correct answer ?

A, It explains that the drivers who have radar detector assume that there are less chances for them to be detected as they will be able to reduce their speed before getting caught and hence drive faster, under the fore mentioned assumption.
B, It doesn't make sense as its talking abt drivers who get ticketed are more likely to exceed rather than drivers who have radar detected.
C, Its a fact, it can be easily gauged from the statement : "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"...so its not an assumption.
D, Its irrelevant, we are talking about the drivers who exceed not the number of drivers who were ticketed twice.
E, Its also irrelevant as its talking about other states.

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Re: CR-please explain this one [#permalink] New post 22 Jan 2008, 20:52
D?

the stem says "ticketed REGULARLY"
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Re: CR-please explain this one [#permalink] New post 22 Jan 2008, 21:24
Now when I think about it...D does make sense...

Look at this link : 11-p231817?t=33790&hilit=A+recent+report+determined+that+although+only+three+percent+of+drivers+on+Maryland#p231817

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Re: CR-please explain this one [#permalink] New post 22 Jan 2008, 21:28
the conclusion states that drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are driver who do not.

Only "B" makes this assumption of "regularly".

Thus "B"
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Re: CR-please explain this one [#permalink] New post 13 Dec 2008, 11:06
Confused between B and D. I will go with B.

Since only 3% of vehicles are equipped with Radar detectors, while 33% of ticketed vehicles are equipped with Radar detectors.
Conclusion: Drivers with vehicles equipped with radar detectors are more likely to exceed speed limit regularly.

Choice B supports the conclusion by clarifying why only 3% of vehicles might be resulting into 33% of ticketed vehicles.
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Re: CR-please explain this one [#permalink] New post 13 Dec 2008, 16:36
I've seen this one before, and I believe it is an LSAT question. The answer is B. It works like this:

Conclusion: Drivers who have radar detectors are more likely to exceed the speed limit regularly than drivers who do not.

Evidence: 3% of drivers on Maryland highways had radar detectors in their vehicles, but 33% of vehicles which got speeding tickets on Maryland highways had radar detectors.

What does the evidence prove? If 3% of the vehicles have radar detectors but those vehicles account for 33% of the tickets, then the evidence DOES prove that vehicles with radar detectors are more likely to get a ticket. Their share of the total number of tickets is greater than their share of the total number of vehicles. This makes it arithmetically inevitable that the percentage of them (again, this is the detector-equipped cars) which gets tickets is bigger than the percentage of other cars which gets tickets.

The conclusion, however, does NOT say that the vehicles with radar detectors are more likely to get a ticket. It says that they are more likely to exceed the speed limit REGULARLY. So the missing assumption is that a vehicle or driver which gets a ticket is therefore also more likely to exceed the speed limit REGULARLY. The evidence proves that these vehicles get more tickets; we need the missing assumption (choice B) to go from there to the conclusion.

The wording of the question actually allows for another, much more subtle flaw in the argument -- one which is NOT used in these answer choices. The evidence actually doesn't say that 3% of VEHICLES have radar detectors; it says that 3% of DRIVERS equip their vehicles with radar detectors. Because of this, the argument also depends on assuming that this 3% of drivers do NOT collectively own 33% or more of the vehicles on Maryland highways. If they did, then it would be possible for the proportion of all vehicles with radar detectors to be the same as, or higher than, the proportion of all tickets which go to those vehicles.
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A recent report determined that although only three percent [#permalink] New post 02 Nov 2009, 05:22
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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
[Reveal] Spoiler:
B
. What's wrong with
[Reveal] Spoiler:
D
?
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Re: Maryland- Assumption Ques! [#permalink] New post 02 Nov 2009, 08:01
In case of an assumption ques you are looking for an equalizing statment (i.e. Assumption Statment = Conclusion Statement). Now the explanation for the OA logic:
Drivers who are ticketed for exceeding the speed limit <is the same as> drivers who equip their vehicles with radar detectors, and
Drivers who are not ticketed <is the same as> drivers who do not equip their vehicles with radar detectors

Now if you read the option [B] you'll find that the meaning of the conclusion statement is just the same as option [B]. Hence, [B] is the best option that fits the bill and is also the OA.

Hope this helps..
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Re: Maryland- Assumption Ques! [#permalink] New post 03 Nov 2009, 12:25
@abhi758- Assumption is not = conclusion.
Evidence+assumption=conclusion
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A recent report determined that although only three percent [#permalink] New post 16 May 2010, 08:02
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 an answer with explanation
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Re: A recent report determined .. [#permalink] New post 17 May 2010, 02:27
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.


Back Ground Info: 3% vehicles ----Maryland highway drivers ---- with radar detectors
Premise : 33% vehicles -- ticked -- exceeding speed (Radar fixed )

Conclusion :
exceed speed limit( radar fixed) > exceed speed limit ( Radar not fixed )

My Ans - B)
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A recent report determined that although only three percent [#permalink] New post 11 Jul 2010, 11:27
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.


Can someone please explain why C is incorrect?
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Re: CR -OG 81 [#permalink] New post 12 Jul 2010, 05:32
We're told that although only 3 percent of people have radar detectors, 33 percent of people ticketed for speeding have them. Based on this, the author concludes that those with radar detectors are more likely to speed.


What if drivers who are not ticketed for speeding, are more likely to speed than drivers who are ticketed for speeding. It's possible that those people who are speeding, but not ticketed for speeding, would not own radar detectors. If that were the case, then the conclusion stating that those who own radar detectors are more likely to speed is no longer valid.

So, for the conclusion to be valid, it must be true 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, choice B.
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Re: CR -OG 81 [#permalink] New post 12 Jul 2010, 05:43
onedayill wrote:
We're told that although only 3 percent of people have radar detectors, 33 percent of people ticketed for speeding have them. Based on this, the author concludes that those with radar detectors are more likely to speed.


What if drivers who are not ticketed for speeding, are more likely to speed than drivers who are ticketed for speeding. It's possible that those people who are speeding, but not ticketed for speeding, would not own radar detectors. If that were the case, then the conclusion stating that those who own radar detectors are more likely to speed is no longer valid.

So, for the conclusion to be valid, it must be true 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, choice B.


I know why B is correct. Iam still trying to figure out why C is incorrect. Is C incorrect because the data in C is already provided in the premises?
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Re: CR -OG 81 [#permalink] New post 12 Jul 2010, 06:02
goalsnr wrote:
onedayill wrote:
We're told that although only 3 percent of people have radar detectors, 33 percent of people ticketed for speeding have them. Based on this, the author concludes that those with radar detectors are more likely to speed.


What if drivers who are not ticketed for speeding, are more likely to speed than drivers who are ticketed for speeding. It's possible that those people who are speeding, but not ticketed for speeding, would not own radar detectors. If that were the case, then the conclusion stating that those who own radar detectors are more likely to speed is no longer valid.

So, for the conclusion to be valid, it must be true 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, choice B.


I know why B is correct. Iam still trying to figure out why C is incorrect. Is C incorrect because the data in C is already provided in the premises?



#3 is irrelevant to the argument.
There is no mention of drivers receiving multiple tickets in the passage, and, furthermore, multiple tickets to the same driver would have no bearing at all on the study anyway (because the study examined the different vehicles ticketed, without regard to the # of tickets for each).
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Re: CR -OG 81 [#permalink] New post 12 Jul 2010, 09:44
In this case your logic is flawed. As per the OG explanation,answer B is correct because the argument brings out a generalization and attributes it to the behaviour of the drivers. The jist of the argument is the drivers who use radar detectors get ticketed more often because they are regular offenders.
Because of this explanation Iam kind of confused why C doesn't make a correct answer.

onedayill wrote:
goalsnr wrote:
onedayill wrote:
We're told that although only 3 percent of people have radar detectors, 33 percent of people ticketed for speeding have them. Based on this, the author concludes that those with radar detectors are more likely to speed.


What if drivers who are not ticketed for speeding, are more likely to speed than drivers who are ticketed for speeding. It's possible that those people who are speeding, but not ticketed for speeding, would not own radar detectors. If that were the case, then the conclusion stating that those who own radar detectors are more likely to speed is no longer valid.

So, for the conclusion to be valid, it must be true 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, choice B.


I know why B is correct. Iam still trying to figure out why C is incorrect. Is C incorrect because the data in C is already provided in the premises?



#3 is irrelevant to the argument.
There is no mention of drivers receiving multiple tickets in the passage, and, furthermore, multiple tickets to the same driver would have no bearing at all on the study anyway (because the study examined the different vehicles ticketed, without regard to the # of tickets for each).
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Re: A recent report determined .. [#permalink] New post 14 Aug 2010, 11:55
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Hey All,

I can explain that difference! Let's take this from the top.

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.

Conclusion: Driver with radar exceed the speed limit more than those with no radar.
Premise: 3% of drivers have radar. 33% of ticketed vehicles have them.
Assumption: Something else about the radar doesn't make you more likely to get ticketed. Speed = tickets.

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.
PROBLEM: This is the opposite of what we want. The people with radar are clearly getting tickets MORE often than those 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.
ANSWER: This is dangerous, because most people ASSUME this already (if you get tickets more, it's because you're speeding more). But remember this is the GMAT, we cannot assume this. We can't jump from "more tickets" to "more speeding", as much as our logic nodes may want it.

(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.
PROBLEM: We don't need to assume this to make our conclusion. Try negating it, and seeing if that destroys the conclusion (this is a way to test correct assumptions). "The number of vehicles that were ticketed for exceeding the speed limit was NOT greater than the number of vehicles that were equipped with radar detectors." So what? It could still be true that people with radar are speeding more.

(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.
PROBLEM: Even if this might work, it's the OPPOSITE of what we'd want. We'd want to assume that these people were only ticketed ONCE, because if the same person was ticketed multiple times, he might only be one person, in which case the conclusion doesn't work. But the negation of this is: "Many of the vehicles that were ticketed for exceeding the speed limit were NOT ticketed more than once in the time period covered by the report." That HELPS the argument, see? Now we can possibly infer that there are MORE PEOPLE with radar speeding, because there are no duplicates.

(E) Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.
PROBLEM: Who cares about stuff outside of Maryland?

Hope that helps!

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Re: A recent report determined .. [#permalink] New post 23 Sep 2010, 06:21
TommyWallach wrote:
Hey All,

I can explain that difference! Let's take this from the top.

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.

Conclusion: Driver with radar exceed the speed limit more than those with no radar.
Premise: 3% of drivers have radar. 33% of ticketed vehicles have them.
Assumption: Something else about the radar doesn't make you more likely to get ticketed. Speed = tickets.

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.
PROBLEM: This is the opposite of what we want. The people with radar are clearly getting tickets MORE often than those 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.
ANSWER: This is dangerous, because most people ASSUME this already (if you get tickets more, it's because you're speeding more). But remember this is the GMAT, we cannot assume this. We can't jump from "more tickets" to "more speeding", as much as our logic nodes may want it.

(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.
PROBLEM: We don't need to assume this to make our conclusion. Try negating it, and seeing if that destroys the conclusion (this is a way to test correct assumptions). "The number of vehicles that were ticketed for exceeding the speed limit was NOT greater than the number of vehicles that were equipped with radar detectors." So what? It could still be true that people with radar are speeding more.

(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.
PROBLEM: Even if this might work, it's the OPPOSITE of what we'd want. We'd want to assume that these people were only ticketed ONCE, because if the same person was ticketed multiple times, he might only be one person, in which case the conclusion doesn't work. But the negation of this is: "Many of the vehicles that were ticketed for exceeding the speed limit were NOT ticketed more than once in the time period covered by the report." That HELPS the argument, see? Now we can possibly infer that there are MORE PEOPLE with radar speeding, because there are no duplicates.

(E) Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.
PROBLEM: Who cares about stuff outside of Maryland?

Hope that helps!

-t



Hi I don't understand how is this conclusion stated, true logically???

Back Ground Info: 3% vehicles ----Maryland highway drivers ---- with radar detectors
Premise : 33% vehicles -- ticked -- exceeding speed (Radar fixed )

Conclusion :
exceed speed limit( radar fixed) > exceed speed limit ( Radar not fixed )

what i feel is that if 33% vehicles -- ticked -- exceeding speed (Radar fixed ) that means that other 77 % vehicles---ticketed---exceeding speed(radar not fixed) should be true... which is opposite of the conclusion...
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Re: A recent report determined .. [#permalink] New post 23 Sep 2010, 10:08
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Did my best, but please don't PM me anymore, as I'm taking a break from the forums.

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Re: A recent report determined ..   [#permalink] 23 Sep 2010, 10:08
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