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Sarah, who is an excellent mechanic, said that in her opinio

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Sarah, who is an excellent mechanic, said that in her opinio [#permalink] New post 16 Nov 2013, 06:36
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Difficulty:

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Question Stats:

49% (02:23) correct 51% (01:06) wrong based on 111 sessions
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Sarah, who is an excellent mechanic, said that in her opinion the used car John is considering is in good mechanical condition. However, it is clear that Sarah cannot be trusted to give an honest opinion, since when Emmett asked her opinion of his new haircut she lied and said she thought it looked good. Therefore, it is very likely that Sarah also lied in giving her opinion of the mechanical condition of that car.

The argument is flawed by virtue of having committed which one of the following errors of reasoning?

(A) It fails to offer any grounds for the attack it makes on the character of the person.
(B) It confuses claims about the past with claims about the future
(C) It bases a sweeping claim on the evidence provided by an instance that is not clearly relevant
(D) It presents evidence in value-laden terms that presuppose the conclusion for which that evidence is being offered.
(E) It wrongly assumes that because someone is a competent judge of one kind of thing, that person will be a competent judge of a very different kind of thing.
[Reveal] Spoiler: OA

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Re: Sarah, who is an excellent mechanic, said that in her opinio [#permalink] New post 16 Nov 2013, 10:35
C it is !

Conclusion: Sarah cannot be trusted to give an honest opinion

Support1: Sarah said John's car is in good mechanical condition.
Support2: Lied about Emmet's haircut
Support3: May have also lied about the car . Therefore, the conclusion.

(A) It fails to offer any grounds for the attack it makes on the character of the person.
Incorrect. It DOES offer grounds for attack (lied about Emmet's haircut)

(B) It confuses claims about the past with claims about the future.
Incorrect. There's no support based on time frame.

(C) It bases a sweeping claim on the evidence provided by an instance that is not clearly relevant
Correct. The claim (that she's lying about the car since she lied about the haircut) is based on the irrelevant incident(haircut). No relation or linkage whatsoever between car condition and haircut likeability has been mentioned.

(D) It presents evidence in value-laden terms that presuppose the conclusion for which that evidence is being offered.
Incorrect. there is NO "pre-supposition" for the conclusion in the evidence given (support statements)

(E) It wrongly assumes that because someone is a competent judge of one kind of thing, that person will be a competent judge of a very different kind of thing.
Incorrect. No support about her being a competent judge of any thing.
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Re: Sarah, who is an excellent mechanic, said that in her opinio [#permalink] New post 17 Nov 2013, 00:34
This question follows a classical style of CR: using "similar" but irrelevant reasoning.

ANALYZE THE STIMULUS:

Fact: Sarah, who is an excellent mechanic, said that in her opinion the used car John is considering is in good mechanical condition.
Fact: when Emmett asked her opinion of his new haircut Sarah lied and said she thought it looked good.
Sub-conclusion: it is clear that Sarah cannot be trusted to give an honest opinion
Main conclusion: it is very likely that Sarah also lied in giving her opinion of the mechanical condition of that car.

Question: The argument is flawed by virtue of having committed which one of the following errors of reasoning?

Pre-thinking: is "opinion of car" relevant to "opinion of hair" :?:

ANALYZE EACH ANSWER:

(A) It fails to offer any grounds for the attack it makes on the character of the person.
Wrong. Out of scope. The MAIN conclusion just says Sarah's opinion about the car is not true. The MAIN conclusion does not attack Sarah's character.

(B) It confuses claims about the past with claims about the future
Wrong. Out of scope. Nothing about past vs. future.

(C) It bases a sweeping claim on the evidence provided by an instance that is not clearly relevant
Correct. Clearly, the opinion about hair is NOT relevant to opinion about car. Hair and car are not in the same category. You can't use an apple to replace an orange. Evidences must be in the same category to make the comparison valid.

(D) It presents evidence in value-laden terms that presuppose the conclusion for which that evidence is being offered.
Wrong. Out of scope. The evidence used in the argument does not presuppose the conclusion. D talks about circular reasoning, but it's NOT the case here.

(E) It wrongly assumes that because someone is a competent judge of one kind of thing, that person will be a competent judge of a very different kind of thing.
Wrong. SHELL game. E is a reverse answer.
The logic of the argument is: A is NOT a competent judge of X ==> A is NOT a competent judge of Y either.
But the logic of E is: A is a competent judge of X ==> A is a competent judge of Y.
Clearly, E is a reverse version of the argument. Hence, E is wrong.

Hope it helps.
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Re: Sarah, who is an excellent mechanic, said that in her opinio   [#permalink] 17 Nov 2013, 00:34
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