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# Radar detectors are devices that sense the nearby use of a radar gun,

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ziyuen wrote:

TRICKY

Radar detectors are devices that sense the nearby use of a radar gun, and, in doing so, alert drivers to the presence of police officers who might catch drivers for speeding. But evidence shows that drivers who have radar detectors in their cars are actually 10% more likely to receive speeding tickets than those who do not have radar detectors. Drivers should therefore save the money they would spend on radar detectors and simply pay the tickets they’re going to receive whether they use a radar detector or not.

Which of the following, if true, would cast the most doubt on the argument above?

A. Several highway patrol agencies have begun developing strategies to target drivers who use radar detectors.
B. Only the drivers most likely to receive speeding tickets purchase and use radar detectors.
C. Radar detectors only cost a fraction of the expense that drivers spend on the purchase and maintenance of their vehicles.
D. Radar detectors do not help drivers avoid other types of tickets, such as those for failure to fully stop at a stop light.
E. Mobile phone companies have recently developed apps that will alert drivers to the presence of police officers along their route.

Hi ziyuen,

I actually reached the solution by eliminating all other possible answers as they strengthen conclusion. However, I still skeptical about explanation answer B. Let's make GMATNinja shares hos thoughts.
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Dear Charles,

The official answer provided by Veritas is not convincing for me to weaken the argument. It assumes that those drivers will get twice or 3 times tickets. I think that it is huge assumption that may or may not be true.

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Yeah, the question-writers were clearly trying to copy an LSAT question here. It's somewhere in LSAT PrepTests #29-38, I think -- but in any case, they didn't do a great job on the execution. Again, it's brutally, brutally hard for even the best test-prep companies to copy the style of actual tests. The GMAT spends \$1500-\$3000 developing each individual question, and I have reason to suspect that the figure is even higher for the LSAT.

So this isn't a criticism of the question-writers, since they're trying to accomplish the impossible... but fwiw, here's where they lost me:

Quote:
In this prompt, the conclusion can be tricky to properly identify because it has two parts to it: “save the money they would spend on radar detectors” and “simply pay the tickets.” The conclusion is essentially saying “radar detectors don’t help drivers avoid tickets,” based on the statistic that radar detector owners get 10% more tickets than those who don’t.

No, that's not really what the conclusion is saying. Here's the conclusion of the passage:

Quote:
Drivers should therefore save the money they would spend on radar detectors and simply pay the tickets they’re going to receive whether they use a radar detector or not.

Now, that's a completely different animal. In writing the explanation, they're committing a cardinal sin of CR: changing the language of the conclusion so that it says something subtly different. Actually, this isn't even subtle: the explanation changes the conclusion pretty radically. As GMATNinjaTwo likes to say, whoever wrote the explanation is "putting words in the passage's mouth" -- and that's a huge error when you're doing CR.

(B) might be the best of the bunch, but it's still a pretty lousy answer. So don't worry too much about this one.
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Agree with GMATNinja, while option B seems to be the possible choice but it is debatable, also OE is not crystal clear.

GMATNinja bb, these days I see quite a few problems especially in SC and CR which actually in a way are not logically sound. Sometimes, these questions end up creating confusions for many people(beginners like me:P).

Can we have some flag associated with each question in which forum moderators can update the quality of the problem? Say something like "Trusted by experts" (Don't know if this is appropriate, but something of this sort). At the moment we only have the difficulty level of the problem which is determined by the answers given by users.
This will help users not to worry about their wrong answers in flawed or debatable questions.
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Assumptions :
1. Radar detectors have no other purposes that can save money for the user but to detect radar guns. Drivers install the RD only to avoid radio guns and thereby fines consequently.
2. Drivers who installed RD are not the ones who frequently exceed the speed limits and end up paying more fines.

By weakening any one of the assumptions we can arrive at the weakener.

A. Several highway patrol agencies have begun developing strategies to target drivers who use radar detectors.
Irrelevant
B. Only the drivers most likely to receive speeding tickets purchase and use radar detectors.
Weakens the 2nd assumption
C. Radar detectors only cost a fraction of the expense that drivers spend on the purchase and maintenance of their vehicles.
Doesn't weaken the argument
D. Radar detectors do not help drivers avoid other types of tickets, such as those for failure to fully stop at a stop light.
Other types are out of scope
E. Mobile phone companies have recently developed apps that will alert drivers to the presence of police officers along their route.[/quote] Further strengthening the conclusion by providing alternate source
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