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# Similar Reasoning.

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14 May 2009, 21:52
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Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 3 sessions

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Dr. A: The new influenza vaccine is useless at best and possibly dangerous. I would never use it on a patient.
Dr. B: But three studies published in the Journal of Medical Associates have rated that vaccine as unusually effective.
Dr. A: The studies must have been faulty because the vaccine is worthless.
In which of the following is the reasoning most similar to that of Dr. A?
(A) Three of my patients have been harmed by that vaccine during the past three weeks, so the vaccine is unsafe.
(B) Jerrold Jersey recommends this milk, and I don’t trust Jerrold Jersey, so I won’t buy this milk.
(C) Wingzz tennis balls perform best because they are far more effective than any other tennis balls.
(D) I’m buying Vim Vitamins. Doctors recommend them more often than they recommend any other vitamins, so Vim Vitamins must be good.
(E) Since University of Muldoon graduates score about 20 percent higher than average on the GMAT, Sheila Lee, a University of Muldoon graduate, will score about 20 percent higher than average when she takes the GMAT
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14 May 2009, 22:30
hmmm

B
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14 May 2009, 22:54
marshpa wrote:

Dr. A: The new influenza vaccine is useless at best and possibly dangerous. I would never use it on a patient.
Dr. B: But three studies published in the Journal of Medical Associates have rated that vaccine as unusually effective.
Dr. A: The studies must have been faulty because the vaccine is worthless.
In which of the following is the reasoning most similar to that of Dr. A?
(A) Three of my patients have been harmed by that vaccine during the past three weeks, so the vaccine is unsafe.
(B) Jerrold Jersey recommends this milk, and I don’t trust Jerrold Jersey, so I won’t buy this milk.
(C) Wingzz tennis balls perform best because they are far more effective than any other tennis balls.
(D) I’m buying Vim Vitamins. Doctors recommend them more often than they recommend any other vitamins, so Vim Vitamins must be good.
(E) Since University of Muldoon graduates score about 20 percent higher than average on the GMAT, Sheila Lee, a University of Muldoon graduate, will score about 20 percent higher than average when she takes the GMAT

IMO C.
Dr A has used circular reasoning to substantiate his argument.

Dr A said that "The new influenza vaccine is useless " and reason was "because the vaccine is worthless". Instead of proper reason, circular reason provides the premises that argument is trying to defend.

Ex: David is best in class because nobody is better than him. Rather than providing exact reason that why david is best, cicular reasoning is stating david's superiority witout any proper reason.

Same reasoning is provided in C: Wingzz tennis balls perform best because they are far more effective

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14 May 2009, 23:42
Type of reasoning is not tested on the GMAT.

This is an LSAT-specific CR.
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15 May 2009, 00:16
Type of reasoning is not tested on the GMAT.

This is an LSAT-specific CR.

yup
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29 Oct 2009, 02:27
Anyway I would go with B. The reasoning of Dr B is depend on his own opinion and does not depend on any other opinions
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29 Oct 2009, 06:27
I agree with Hades that this type of question is much more likely to appear on the LSAT than on the GMAT. In fact, on the LSAT, the question stem would ask "which of the following displays FLAWED reasoning most similar to that of Dr. A?"

That said, C is the best answer.

Dr. A is taking as a given (evidence) that the vaccine is useless, and then basing his or her conclusion about the studies on that evidence. This is flawed because the studies should be judged to be true or false regardless of any preconceived notion about the vaccine.
Likewise, answer choice C is claiming as evidence that Wingzz tennis balls are the most effective, and then basing its conclusion, "they perform best," on that evidence; the same backwards reasoning shown in the prompt. The performance of tennis balls is not BASED on their effectiveness, it is the thing that tells us how effective they are, just like the studies should tell us whether the vaccine works or not.

The only other viable choice, B, is incorrect because it displays a different distinct flaw, common on the LSAT: attacking a speaker rather than a speaker's ideas. There is no analogue to "Jerrold Jersey" (a person whose opinion should not be trusted) in the prompt. In the prompt, the attack on the studies is impersonal, based on a generalization. In B, the attack on Jerrold Jersey IS the generalization.

Alex
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29 Oct 2009, 10:39
B?
Re: Similar Reasoning.   [#permalink] 29 Oct 2009, 10:39
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