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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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Re: A recent report determined that although only three percent [#permalink] New post 25 Apr 2013, 03:46
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Re: A recent report determined that although only three percent [#permalink] New post 26 Apr 2013, 04:50
It is easy to find right answer using Negation technique.

For example:
(B) Drivers who are ticketed for exceeding the speed limit are less likely to exceed the speed limit regularly than are drivers who are not ticketed.
this transformation is clearly opposite to the meaning stated in the argument.
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Re: A recent report determined that although only three percent [#permalink] New post 26 Apr 2013, 05:15
stolyar wrote:
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.

It is easy to find right answer using Negation technique.

For example:
(B) Drivers who are ticketed for exceeding the speed limit are less likely to exceed the speed limit regularly than are drivers who are not ticketed.
this transformation is clearly opposite to the meaning stated in the argument.
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Re: A recent report determined that although only three percent [#permalink] New post 26 Apr 2013, 17:56
Please do a search on the board befor post the question that is discussed several times


Please provide with oA and OE
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Re: A recent report determined that although only three percent [#permalink] New post 26 Apr 2013, 18:44
aditya111 wrote:
Please do a search on the board befor post the question that is discussed several times

Start of this particular thread is 2003 and all other duplicate threads are merged here. There was no discussion on this same question prior to 2003. Did you find any other thread with same question recently?

aditya111 wrote:
Please provide with oA and OE

If you read the thread from the beginning, you will find OA and many discussions.
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Re: A recent report determined that although only three percent [#permalink] New post 23 Jul 2013, 17:28
I had some trouble with this one and the key was recognizing the following:
- tiny fraction of people have radar detectors E.g, if there are 100 total drivers, only 3 are RD
- 1/3 of all the people who get tickets are the RDs. E.g, so our 3 dudes are getting alot of the tickets!
- conclusion - well, people with the rd must be speeding regularly.

I missed the key word "regularly"
A) This does not help the conclusion, it is actually against it. our 3 dudes are getting lots of tickets!
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.
--- > This is the correct answer because it helps the conclusion by saying that the ticketed drivers keep speeding regularly once they get the ticket.
(C) The number of vehicles that were ticketed for exceeding the speed limitwas greater than the number of
vehicles that were equipped with radar detectors.
--> Not relevant.
(D) Manyof the vehicles that were ticketed for exceeding the speed limitwere ticketed more than once in the
time period covered by the report.
----> This is tricky but there is no mention of the maryland drivers or people with radars.
(E) Drivers on Maryland highways exceeded the speed limitmore often than did drivers on other state
---> out of scope.
highways not covered in the report.
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Re: A recent report determined that although only three percent [#permalink] New post 07 Aug 2013, 14:48
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We'll attack this question with some framework + prethinking.

Framework: Expectation vs Actuality
Pre-thinking: Link the two relevant topics

This question starts off with the expectation vs actuality framework
Expectation: 3% (low percentage) with radar detectors ->might expect 3% of ticketed cars to have radar detectors
Actuality: 3% (low percentage) with radar detectors -> actually 33% of ticketed cars have radar detectors

Conclusion: Those using radar detectors are MORE likely to exceed speed limit REGULARLY.

Keep in mind that the word "regularly" adds a dimension of "degree" into the conclusion. It's not a simple relationship between "detector = speed more", but rather "detector = consistently speed more"


So our pre-thinking should be to find an answer choice that connects those two topics:
1) something to do with "detector"
2) something to do with "consistently speeding more" -- keyword 'consistently' is important

(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.


So does (B) talk about the detector? Not directly BUT it does so indirectly.
[Drivers who are ticketed for exceeding the speed limit ]
We already established before that a good percentage of those who are ticketed (33%) are those WITH detectors. Thus (B) is already referencing this segment of the population. Then the second half says this group (those with detectors) are more likely to exceed the speed limit REGULARLY -- fully captures the conclusion we had. In fact, it almost sounds like a repeat of the conclusion -- but it does so by substituting that first part ("detectors") with something slightly different.



(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.

1) "detector" -- YES
2) "consistently speeding more" -- NO, goes in opposite direction and says LESS likely.



(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.
1) "detector" -- no, this is talking about the # of vehicles...not the population of those that speeded. Notice the other answer choices reference "drivers" -- not "the number of vehicles"
2) "consistently speeding more" -- no


(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.
1) "detector" -- no, this is talking about some detail about a portion of the vehicles -- we only care about the drivers that used the "detector" -- not the details about some irrelevant segment
2) "consistently speeding more" -- no

(E) [ Drivers on Maryland highways ] exceeded the speed limit more often than did drivers on other state
highways not covered in the report.

1) "detector"-- no, talks about drivers in Maryland as a whole. The conclusion only cares about drivers who used the detector, not the whole group.
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Re: [#permalink] New post 09 Sep 2013, 20:00
ranga41 wrote:
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.


Can someone please elaborate? I think I'm just unclear what the question is really asking. B, sounds completely arbitrary to me even after reading the explanations.

Thank you!
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Re: A recent report determined that although only three percent [#permalink] New post 22 Sep 2013, 05:01
Can someone explain this question using a numerical example.. its really confusing.
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Re: [#permalink] New post 07 Jan 2014, 04:16
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



Could you explain why D doesnt hold the conclusion? :(
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Re: A recent report determined that although only three percent [#permalink] New post 07 Jan 2014, 11:04
stolyar wrote:
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.



1. 3% vehicles in Maryland highways are equipped with radar detectors , while 97% don't.

2. 33% of the total vehicles ticked for speeding were quipped with radar detectors.

3. Vehicles equipped with radar detectors are more likely to exceed speed limits regularly....

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.

The passage concludes - Possessing a radar detector in vehicles increases the possibility of exceeding speed limits.. So this can't be the required assumption.

(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.

True our conclusion is based on this assumption - Keep it aside....

(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.

We can't compare the highlighted parts.

(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.

Might be possible that during the survey period the same vehicles were ticketed more than once..

(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...



Left with (B) and (D)


(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.

(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.


(B) presents a regular phenomenon of drivers while (D) brings in a new idea about recurrence of ticketing during the survey period ...

I would prefer to go with (B) since it accurately helps us reach the conclusion...
Re: A recent report determined that although only three percent   [#permalink] 07 Jan 2014, 11:04
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