assumption question : GMAT Verbal Section
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assumption question

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assumption question [#permalink]

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New post 12 May 2007, 07:58
A large number of drivers routinely violate highway speed limits. Since driving at speeds that exceed posted limits is a significant factor in most accidents, installing devices in all cars that prevent those cars from traveling faster than the speed limit would prevent most accidents.
  
Which one of the following is an assumption on which the argument depends?

(A) A person need not be a trained mechanic to install the device properly.
(B) Most accidents are caused by inexperienced drivers.
(C) A driver seldom needs to exceed the speed limit to avoid an accident when none of the other drivers involved are violating the speed limit.
(D) Most drivers who exceed the speed limit do so unintentionally.
(E) Even if the fines for speed-limit violations were increased, the number of such violations would still not be reduced.

why is it c?
  
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New post 12 May 2007, 08:24
It is C, because if drivers usually needed to exceed the speed limits to prevent an accident, the conclusion of the argument (installing devices in cars that prevent those cars from traveling faster than the speed limit would prevent most accidents) wouldn't be truth.
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New post 14 May 2007, 05:51
Why not D ?
What is AO ?
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New post 14 May 2007, 05:55
the OC is C

bc if we negate the answer

"drivers need to speed in order to avoid accidents" it disproves the assumtpion... basically, if u negate an assumption and it weakens it, it is the correct one.
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New post 14 May 2007, 05:58
the OC is C

bc if we negate the answer

"drivers need to speed in order to avoid accidents" it disproves the assumtpion... basically, if u negate an assumption and it weakens it, it is the correct one.

D if u negate it, does not weaken the answer

"drivers
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New post 04 Oct 2016, 23:10
D is a very tricky option. So option C states that since its rarely possible to avoid the accidents while exceeding the speed limit hence given none of the drivers violate the speed. Those drivers don't violate the speed when accidents are caused by them? What does the word 'involves' indicate?In that case we can assume that devices are essential.
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New post 06 Oct 2016, 04:54
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What does the argument state -

Installing devices --> Most accidents would be prevented.

A - irrelevant to the argument above. Whether the device can be installed by trained or untrained people has no bearing on its effectiveness.
B - not relevant. the argument talks about the effectiveness of those devices. The amount of experience they have is irrelevant.
C - correct answer. Let us assume a value for seldom - say 1%.
Only about 1% of the time does a driver need to exceed the speed limit to avoid an accident when others are not exceeding the speed limit. This basically says that you do not need to exceed the speed limit to avoid an accident when everyone else is going slow. Strengthens.
Negate this -
About 95% of the time a driver needs to exceed speed limit to avoid an accident when others are not exceeding the speed limit. -> Destroys the argument. Suggests that accidents cannot be avoided if you impose speed limits.
Also, notice that "when others are not exceeding the speed limit" is an important part of the assumption. This depicts a scenario in which "all cars" (read the argument again) have such devices installed. If some people do, then such a scenario does not describe the situation that the argument deals with. (Since all cars have such devices installed, none of them will exceed the speed limit).
D - Negate this option. Most drivers who exceed the speed limit do so intentionally. -> If they do so intentionally, it is high time that they be stopped. This negation clearly strengthens the argument. Incorrect.
E - "increasing fines" has no impact on the effectiveness of the strategy. The argument only talks about the effectiveness of the strategy to install devices in order to reduce accidents. We are NOT discussing the effectiveness of the strategy to impose higher fines on speeding drivers.
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Re: assumption question   [#permalink] 06 Oct 2016, 04:54
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