Left-handed persons suffer more frequently than do

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

06 Apr 2004, 13:06

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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 mathematics.
(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.

I am not sure about the answer.Got it from an old post.

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06 Apr 2004, 13:12

Very confusing :wall

....would like to go for D...

Vivek.
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06 Apr 2004, 13:23

Should be C or E...Would go for C....

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06 Apr 2004, 13:33

My answer is C

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06 Apr 2004, 13:49

C should be it
I would like to know vivek's reasoning!!!

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06 Apr 2004, 13:57

Took me a while but C is it. Again, here is a number example to prove my case:

Key sentence: Left-handers tend to have an advantage over the right-handed majority

We know from above that there are more right handed people than left handed people.
Let's say there are 90 right handed people and 10 left handed people for a total of 100.

Left-handers tend to have an advantage over the right-handed majority in terms of mathematics which is largerly controlled by the right part of the brain

Hence, let's say that 60% of left handers are above average in mathematics and 10% of right handers are above average in mathematics. This satifies the above premise and translates to:

6 left handed person good in math
9 right handed persons good in math

Quote:

There are proportionally more left-handers among people whose ability to reason mathematically is above average

The above means 6/ [9+6] = 40%

Quote:

than there are (left handers) among people with poor mathematical reasoning ability.

The above means [10-6] / [4+80] = 4.7%
[4+80] = people not good in math

Above two concur with what C means. As a matter of fact, this relationship can NEVER be violated and will ALWAYS hold true. Hence, C MUST be the answer
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06 Apr 2004, 14:03

All the other answers were very definitive and I thought from the stem you can't infer a definite conclusion so went for D which says..'will probably'....
Anyway I was lost...and after seeing Paul's explanation I can say I was 'completely' lost.

Vivek.
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06 Apr 2004, 14:13

Sometimes, working out those "proportion vs number" problems, I find it better to back it up with numbers. However, does it complicate the problem more than it already is :stupid

?
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07 Apr 2004, 04:05

B is the safest bet as it accounts for both the premises. Keyword is most.

rgds,
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07 Apr 2004, 06:22

Paul, nice explanation..........I think it should be C....even older posts were leaning towards C but there aint a definite correct answer....thanks!!

[#permalink] 07 Apr 2004, 06:22

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