I was doubting between A and D. Finally I choose D....the wrong one! Can anybody explain why this one cannot be the right answer?
Hi,
We can use the Kaplan denial test to prove that A must be true (and therefore correct) and that D could be false (and therefore incorrect):
If A were untrue--if susceptibility to classical migraines WAS NOT more dependent on hereditary factors--then there would be no available explanation for the discrepany in likelihood of genetic transmission, and thus that discrepancy could not exist, and thus a part of the passage would become falsified. But in an inference question every part of passage is necessarily true. Thus, choice A must be true.
On the other hand, choice D could be false without falsifying any part of the passage (primarily because the passage did not establish anything that had to be true about "children"--"children" are outside the scope).
TAKEAWAYS: --we can use the Kaplan denial test in inference questions (many people think it can only be used in necessary assumption questions). --the correct answer will always be very CLOSE to the passage (notice that every idea of choice A is discussed in the passage either explicitly or implicitly); converesely, facts about "children" cannot be inferred from the text of the passage.
Re: CR: common vs. classical migraines [#permalink]
Posted: Sat Jul 09, 2011 12:36 pm
Rice (Jones) Thread Master
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From above statistics, we can infer that brothers & sisters of classical sufferers have 4x chances whereas brothers & sisters of common sufferers have 2x chances Because brothers & sisters (siblings) are related by blood, we can say that hereditary factor play a major role in acquiring classical migraine than in common migraine. This is the position of option A.
On the other hand, spouses of common migraine have 2x chances whereas spouses of classical migraine have x chance From the statistics, Spouses of common migraine are more prone than are those of classical migraine. However, this is not discussed in any of the options.
Do I make any sense or am I over stating what is meant in the stem?
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zuberahmed
Re: CR: common vs. classical migraines [#permalink]
Posted: Sat Jul 23, 2011 9:54 pm
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Quite straightforward. It's A. My reasons for choosing this is as follows:
(A) Susceptibility to classical migraines is more dependent on hereditary factors than is susceptibility to common migraines. [Correctly identifies support to the premise and the major part of the passage states the instances for this] (B) Unmarried adults are more likely to suffer from classical migraines than they are to suffer from common migraines. [There is nothing in the passage that suggests how vulnerable unmarried adults will be] (C) People who do not experience migraine headaches are unlikely to have spouses who are migraine headache sufferers.[Again, out of scope] (D) Children of people who suffer from common migraines are more likely than the general population to experience a common migraine.[Out of scope, also] (E) Between one-quarter and one-half of the general population suffer from either common or classical migraine headaches.[Out of scope]
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Practicegmat
Re: Among people experience migraine headaches, some experience [#permalink]
Posted: Sat Nov 19, 2011 4:47 am
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I was doubting between A and D. Finally I choose D....the wrong one! Can anybody explain why this one cannot be the right answer?
Except A, all other options can be ruled out on the basis that they all include information that is outside of the argument where the argument talks about siblings and spouses only: no unmarried people, no children, etc.
Among people experience migraine headaches, some experience what doctors call"common" migraines, whereas others experience "classical" migraines. Siblings and spouses of common migraine sufferers are themselves twice as likely as the general population to experience common migraines. Siblings of classical migraine sufferers are four times more likely than the general population to experience classical migraines, whereas spouses of classical migraine suferers are no more likely than the general population to experience such headaches.
The information above provides the most support for which of the following hypotheses?
(A) Susceptibility to classical migraines is more dependent on hereditary factors than is susceptibility to common migraines. (B) Unmarried adults are more likely to suffer from classical migraines than they are to suffer from common migraines. (C) People who do not experience migraine headaches are unlikely to have spouses who are migraine headache sufferers. (D) Children of people who suffer from common migraines are more likely than the general population to experience a common migraine. (E) Between one-quarter and one-half of the general population suffer from either common or classical migraine headaches.
After reading stimulus I made following chart : sib spouse comm. 2 2 class. 4 1 where numbers denote likelihood of migraine wrt common man
thus we can see comm migraine effect sibling and spouse equally while class migraine effect siblings more than spouse. Now siblings share hereditary factors but not spouses. hence option A seemed correct on first thought.
B out of scope we could ascertain nothing form stimulus abt unmarried .
C again we can also say something abt people who have migraine from data in stimulus.
D no specific info childeren could be deduced from arg.
E nothing abt population as a whole could be ascertain from stimulus.
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