Left-handed persons suffer more frequently than do : GMAT Critical Reasoning (CR)
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# Left-handed persons suffer more frequently than do

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Left-handed persons suffer more frequently than do [#permalink]

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04 Jan 2011, 13:04
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Left-handed persons suffer more frequently than do
right-handed persons from certain immune disorders,
such as allergies. Left-handers tend to have an
advantage over the right-handed majority, however,
on tasks controlled by the right hemisphere of the
brain, and mathematical reasoning is strongly under
the influence of the right hemisphere in most people.

If the information above is true, it best supports
which of the following hypotheses?
(A) Most people who suffer from allergies or other
such immune disorders are left-handed rather
than right-handed.
(B) Most left-handed mathematicians suffer from
some kind of allergy.
(C) There are proportionally more left-handers among
people whose ability to reason mathematically
is above average than there are among people
with poor mathematical reasoning ability.
(D) If a left-handed person suffers from an allergy,
that person will probably be good at mathemat-
ics.
(E) There are proportionally more people who suffer
from immune disorders such as allergies than
there are people who are left-handed or people
whose mathematical reasoning ability is
unusually good.

The ans does not make sense to me. Please can someone explain this
[Reveal] Spoiler: OA

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Re: Left-handed persons suffer more frequently [#permalink]

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04 Jan 2011, 13:29
I also wanted to know if these 2 types of questions are treated as inference types... Please can someone clarify.

If the information above is true, it best supports which of the following hypotheses?
Which one of the following is best supported on the basis of the information above?
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Re: Left-handed persons suffer more frequently [#permalink]

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04 Jan 2011, 13:38

(A) Most people who suffer from allergies or other
such immune disorders are left-handed rather
than right-handed.
More frequently not most people. OUT
(B) Most left-handed mathematicians suffer from
some kind of allergy.
mathematicians out of scope.
(C) There are proportionally more left-handers among
people whose ability to reason mathematically
is above average than there are among people
with poor mathematical reasoning ability.
if left handers have a better control over the right hemisphere and this leads to the strong mathematical reasoning,then the proportion of the left-handed should be greater.
(D) If a left-handed person suffers from an allergy,
that person will probably be good at mathemat-
ics.
Definite statement.OUT
(E) There are proportionally more people who suffer
from immune disorders such as allergies than
there are people who are left-handed or people
whose mathematical reasoning ability is
unusually good.
We don't know from the stem that there proportionally more people who suffer
from immune disorders such as allergies.OUT
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Re: Left-handed persons suffer more frequently [#permalink]

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04 Jan 2011, 14:20
+1 C
The key is being careful when you read the argument and the answer choice.
Here is my explanation:

ajit257 wrote:
Left-handed persons suffer more frequently than do
right-handed persons from certain immune disorders,
such as allergies. Left-handers tend to have an
advantage over the right-handed majority, however,
on tasks controlled by the right hemisphere of the
brain, and mathematical reasoning is strongly under
the influence of the right hemisphere in most people.

If the information above is true, it best supports
which of the following hypotheses?
(A) Most people who suffer from allergies or other
such immune disorders are left-handed rather
than right-handed. - "Most" is wrong. Maybe the proportions are 51% / 49%.
(B) Most left-handed mathematicians suffer from
some kind of allergy. - We are not talking about mathematicians; we are talking about math skills.
(C) There are proportionally more left-handers among
people whose ability to reason mathematically
is above average than there are among people
with poor mathematical reasoning ability.
The argument tells us that left-handed people usually are better in math. Therefore, there are more left-handed people in the group of people good in math. CORRECT.
(D) If a left-handed person suffers from an allergy,
that person will probably be good at mathemat-
ics. - The argument does not mention a causal relationship between allergies and maths skills.
(E) There are proportionally more people who suffer
from immune disorders such as allergies than
there are people who are left-handed or people
whose mathematical reasoning ability is
unusually good. - Tough one. Notice that the answer choice says "or"; in other words, you have to sum left-handed people plus people who are good in math. But you don't know how many they are as a result of that sum. Therefore, you cannot make the comparison of the answer choice.
The ans does not make sense to me. Please can someone explain this

What do you think?
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Re: Left-handed persons suffer more frequently [#permalink]

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05 Jan 2011, 07:40
metallicafan,
I also wanted to know if this question "it best supports which of the following hypotheses?" is treated as inference then C is the most obvious choice but i still did not get wht is it got to do with immune disorders,
such as allergies
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Re: Left-handed persons suffer more frequently [#permalink]

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18 May 2011, 03:43
clean C, giving a solid reason.
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Re: Left-handed persons suffer more frequently than do [#permalink]

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10 Aug 2012, 09:22
i also go with C. kindly post the OA
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Re: Left-handed persons suffer more frequently than do [#permalink]

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11 Aug 2012, 06:36
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Expert's post
The key to this question is to not forget that the proportion between left-handers and right-handers is skewed. Therefore, just because lefties are more likely to have allergies then righties does not mean that if somebody has allergies he/she is more likely to be lefty. After all, if 90% of population is righty, then there are far more righties and we can't draw this conclusion. (C) takes this phenomenon into account. If lefties are stronger at math, then proportionally you will see more lefties in an above average math group than a below average group.
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Re: Left-handed persons suffer more frequently than do [#permalink]

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26 Oct 2013, 09:39
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Re: Left-handed persons suffer more frequently than do [#permalink]

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07 Mar 2016, 19:17
ajit257 wrote:
Left-handed persons suffer more frequently than do
right-handed persons from certain immune disorders,
such as allergies. Left-handers tend to have an
advantage over the right-handed majority, however,
on tasks controlled by the right hemisphere of the
brain, and mathematical reasoning is strongly under
the influence of the right hemisphere in most people.

If the information above is true, it best supports
which of the following hypotheses?
(A) Most people who suffer from allergies or other
such immune disorders are left-handed rather
than right-handed.
(B) Most left-handed mathematicians suffer from
some kind of allergy.
(C) There are proportionally more left-handers among
people whose ability to reason mathematically
is above average than there are among people
with poor mathematical reasoning ability.
(D) If a left-handed person suffers from an allergy,
that person will probably be good at mathemat-
ics.
(E) There are proportionally more people who suffer
from immune disorders such as allergies than
there are people who are left-handed or people
whose mathematical reasoning ability is
unusually good.

The ans does not make sense to me. Please can someone explain this

I reached the answer by POE...
LH > ID ex A.
but LH->better use right H of brain -> resp. math reasoning.

A. too strong. we cannot infer this from the argument. we only know that LH suffer more frequently . but it does not mean that the majority of those who suffer are left handed.
B. the argument does not provide any cause-effect relationship between disorder and math reasoning. so out
C. the language is the same as in the argument. the proportion of those who have math reasoning above average is more for LH than for the RH. this is exactly given in the argument.
D. again, no cause-effect relationship so out.
E. compares allergy with math reasoning..completely illogical..

so C only works..
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Left-handed persons suffer more frequently than do [#permalink]

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26 Mar 2016, 07:30
I feel C simply is not right.

(C) There are proportionally more left-handers among
people whose ability to reason mathematically
is above average than there are among people
with poor mathematical reasoning ability.

what this sentence means is: among "people whose ability to reason mathematically is above average"(group A), "there are proportionately more left-handers"(subgroup I) than right-handers (subgroup II). say, we have 100 hundred in group A, can we say subgroup I have more people than subgroup II. No, because right-handers are majority. we might have 1000 right-handers and only 5 left-handers. even if all 5 left-handers are mathematically superior, there are still 95 left-handers have similar ability.
Left-handed persons suffer more frequently than do   [#permalink] 26 Mar 2016, 07:30
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