Left-handed persons have an advantage over right-handed : GMAT Critical Reasoning (CR)
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# Left-handed persons have an advantage over right-handed

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24 Oct 2008, 10:32
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Left-handed persons have an advantage over right-handed persons on tasks that are controlled by the right hemisphere of the brain and painting, for most people, is a task mostly governed by the right hemisphere of the brain. However, left-handed persons contract viruses, such as influenza, more frequently than do right-handed persons.

The information above, if true, best supports which of the following hypotheses?

(A) There is a greater proportion of left-handed persons among painters than there is among non-painters.

(B) Most people who contract influenza or other viruses are left-handed rather than right-handed.

(C) If a left-handed person contracts a virus similar to influenza, that person will probably be a painter

(D) Most left-handed painters are more susceptible to influenza than is the population as a whole.

(E) There are a greater proportion of left-handed persons among painters than there are right-handed persons among non-painters.

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24 Oct 2008, 10:40
D for me
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24 Oct 2008, 12:00
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tarek99 wrote:
Left-handed persons have an advantage over right-handed persons on tasks that are controlled by the right hemisphere of the brain and painting, for most people, is a task mostly governed by the right hemisphere of the brain. However, left-handed persons contract viruses, such as influenza, more frequently than do right-handed persons.

The information above, if true, best supports which of the following hypotheses?

(A) There is a greater proportion of left-handed persons among painters than there is among non-painters.

How do we know? We just know that LHP has advantage over RHP for tasks such as painting. can't say this

(B) Most people who contract influenza or other viruses are left-handed rather than right-handed.

LHP contract easily than RHP does not mean that number of LHP with influenza is greater than number of RHP with influenza

(C) If a left-handed person contracts a virus similar to influenza, that person will probably be a painter

Makes a bold conclusion, need not be.

(D) Most left-handed painters are more susceptible to influenza than is the population as a whole.

Yes, it is possible The word susceptible does not make assurances and hence is a good choice.

(E) There are a greater proportion of left-handed persons among painters than there are right-handed persons among non-painters.

Same as A

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24 Oct 2008, 12:31
(A) There is a greater proportion of left-handed persons among painters than there is among non-painters. [ It only says the possibility of left handed person being painter is high – no comparison]

(B) Most people who contract influenza or other viruses are left-handed rather than right-handed. [Too extreme]

(C) If a left-handed person contracts a virus similar to influenza, that person will probably be a painter [Enticing but nothing in the passage supports this]

(D) Most left-handed painters are more susceptible to influenza than is the population as a whole. [Hold on]

(E) There are a greater proportion of left-handed persons among painters than there are right-handed persons among non-painters. [ need not]

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24 Oct 2008, 12:41
Alright, I thought I posted a response to this but it looks like I didn't. Anyways, I choose (A).

I think the popular choice, (D), makes the assumption that the population as a whole contains more righties than lefties.
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24 Oct 2008, 18:55
D for me

whats the OA?
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24 Oct 2008, 21:24
IMO E .... I am not that much convienced with D, cause it is saying "Most left-handed painters" and stumulus says that ppl are "More frequently" contract viruses....it is comparing number of ppl vs frequency....which I don't think right....

Really tough one....difficult to understand para first and then choices ....anyway what is OA?
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24 Oct 2008, 21:40
tarek99 wrote:
Left-handed persons have an advantage over right-handed persons on tasks that are controlled by the right hemisphere of the brain and painting, for most people, is a task mostly governed by the right hemisphere of the brain. However, left-handed persons contract viruses, such as influenza, more frequently than do right-handed persons.

The information above, if true, best supports which of the following hypotheses?

(A) There is a greater proportion of left-handed persons among painters than there is among non-painters.
(B) Most people who contract influenza or other viruses are left-handed rather than right-handed.
(C) If a left-handed person contracts a virus similar to influenza, that person will probably be a painter
(D) Most left-handed painters are more susceptible to influenza than is the population as a whole.
(E) There are a greater proportion of left-handed persons among painters than there are right-handed persons among non-painters.

Agree with D as it covers both the information provided in the passage.
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24 Oct 2008, 21:40
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tarek99 wrote:
Left-handed persons have an advantage over right-handed persons on tasks that are controlled by the right hemisphere of the brain and painting, for most people, is a task mostly governed by the right hemisphere of the brain. However, left-handed persons contract viruses, such as influenza, more frequently than do right-handed persons.

The information above, if true, best supports which of the following hypotheses?

(A) There is a greater proportion of left-handed persons among painters than there is among non-painters.
IMO - A: proportion of left handed people among painters higher than left handed among non-painters
(B) Most people who contract influenza or other viruses are left-handed rather than right-handed.
Goes beyond the sample - Left handed people are easily susceptible to viruses but it doesn't mean "most people...."(C) If a left-handed person contracts a virus similar to influenza, that person will probably be a painter
Absurd: 10 left handed people out of 100 out of which 8 - painter and 10 are easliy susceptible to viruses, so probability of person with virus and a pisnter is only 0.08....way low to pick this one!
(D) Most left-handed painters are more susceptible to influenza than is the population as a whole.
Fact same as given in the problem....
(E) There are a greater proportion of left-handed persons among painters than there are right-handed persons among non-painters.
left handed people among painters: say 10 left handed out of 70 pianters and right handed [90 right handed] among non painters i.e.30 - WRONG! PS: Used same data as in C.

By process of elimination - A is the choice for me
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25 Oct 2008, 04:07
tarek99 wrote:
Left-handed persons have an advantage over right-handed persons on tasks that are controlled by the right hemisphere of the brain and painting, for most people, is a task mostly governed by the right hemisphere of the brain. However, left-handed persons contract viruses, such as influenza, more frequently than do right-handed persons.

The information above, if true, best supports which of the following hypotheses?

(A) There is a greater proportion of left-handed persons among painters than there is among non-painters.

Reverse causation. Stimulus says LHPs have advantage in painting not vice versa.

(B) Most people who contract influenza or other viruses are left-handed rather than right-handed.
Reverse causation. Stimulus says LHPs contract influenza, not vice versa.
(C) If a left-handed person contracts a virus similar to influenza, that person will probably be a painter
May be, but the conclusion is weak. Hold On.
(D) Most left-handed painters are more susceptible to influenza than is the population as a whole.
Strongest contender. Both the premises support this.
(E) There are a greater proportion of left-handed persons among painters than there are right-handed persons among non-painters.
May be. But, concluson is weak.

Hence, D.

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25 Oct 2008, 06:52
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25 Oct 2008, 14:50
D makes a good assumption
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26 Oct 2008, 01:16
OA is A
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26 Oct 2008, 01:26
tarek99 wrote:
OA is A

is there any OE?
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26 Oct 2008, 02:30
bigtreezl wrote:
tarek99 wrote:
OA is A

is there any OE?

yes, here it is:

This question is an inference question. Therefore the task is to find an inevitable conclusion from information given. Find what must be true.

Read the Argument and Extract Necessary Information:

In inference questions:

Note how specific the topics are, watch out for percents versus numbers, look for the logical combination of two points.

Known:

• Lefties have an advantage on tasks controlled by the right side of the brain
• Painting is controlled by the right side of the brain
• Lefties get viruses more frequently

Formulate an Answer to the Question
There are 2 possible answers that should spring to mind based on the facts presented:

1. Lefties have advantage on right brain functions + painting is right brain function = lefties have advantage in painting.

2. Lefties contract viruses more frequently + lefties have advantage in right brain functions + painting is right brain function = people with advantage painting contract viruses more frequently.

(A) Close in to what we said- Keep.

(B) Not true we know lefties contract more often but what if there are significantly fewer lefties in the world? If that is the case than most who contract would be righty but lefties might still contract more often, thus this does not have to be true – eliminate.

(C) The argument gives no indication that there is a cause and effect link between contracting viruses and painting, thus this does not have to be true – eliminate.

(D) The argument makes no mention of the sub group “left-handed painters”. You are told that lefties in general contract viruses more often but not whether left-handed painters do so more often than other left-handers or other sub-groups of lefties, thus this does not have to be true – eliminate.

(E) The argument gives no information about non-painters, thus this does not have to be true – eliminate.

NOTE: from a score scale from 1 to 51, this has been ranked as score level 46! so you can imagine how hard this is and should also give you some awareness of what type of difficulty that you can expect when you hit 45+ range on the verbal section.
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26 Oct 2008, 07:25
tarek99 wrote:
bigtreezl wrote:
tarek99 wrote:
OA is A

is there any OE?

yes, here it is:

This question is an inference question. Therefore the task is to find an inevitable conclusion from information given. Find what must be true.

Read the Argument and Extract Necessary Information:

In inference questions:

Note how specific the topics are, watch out for percents versus numbers, look for the logical combination of two points.

Known:

• Lefties have an advantage on tasks controlled by the right side of the brain
• Painting is controlled by the right side of the brain
• Lefties get viruses more frequently

Formulate an Answer to the Question
There are 2 possible answers that should spring to mind based on the facts presented:

1. Lefties have advantage on right brain functions + painting is right brain function = lefties have advantage in painting.

2. Lefties contract viruses more frequently + lefties have advantage in right brain functions + painting is right brain function = people with advantage painting contract viruses more frequently.

(A) Close in to what we said- Keep.

(B) Not true we know lefties contract more often but what if there are significantly fewer lefties in the world? If that is the case than most who contract would be righty but lefties might still contract more often, thus this does not have to be true – eliminate.

(C) The argument gives no indication that there is a cause and effect link between contracting viruses and painting, thus this does not have to be true – eliminate.

(D) The argument makes no mention of the sub group “left-handed painters”. You are told that lefties in general contract viruses more often but not whether left-handed painters do so more often than other left-handers or other sub-groups of lefties, thus this does not have to be true – eliminate.

(E) The argument gives no information about non-painters, thus this does not have to be true – eliminate.

NOTE: from a score scale from 1 to 51, this has been ranked as score level 46! so you can imagine how hard this is and should also give you some awareness of what type of difficulty that you can expect when you hit 45+ range on the verbal section.

Good question!!!....what's the source???
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26 Oct 2008, 13:15
What is the source of this question? I will be very surprised if it is an official GMAC question, because choice A is wrong, and it is not quite clear whether choice D is correct. (If it is a Kaplan question, please tell me ASAP. I work for Kaplan, and we don't like to leave errors lying around in our materials.)

The fact that left-handed people have an advantage in painting simply does not prove that a larger proportion of left-handed people actually BECOME PAINTERS (choice A). An inference question does require an inevitable inference, and this one is not.

D may be inevitable, depending on how we interpret the statement that left handers contract viruses "more frequently" than right handers. If it means that ALL left handed people contract viruses more frequently than ALL right handed people, then D is clearly inevitable: Every left handed person, whether a painter or not, must be more susceptible than every right handed person. Therefore, left handed painters (just because they ARE left handed, not because they are painters) must be more susceptible than "the general population", which contains both righties and lefties.

If that is the intended meaning of "more frequently", then D could even say "all", not just "most". If "all" is inevitable, then "most" is inevitable as well, and so D is still correct.

But if "more frequently" is a statistical statement -- i.e., left handers are more susceptible ON AVERAGE, but the distributions of susceptibility may overlap -- then we cannot even conclude "most". We can't even conclude "any". Not only do we not know whether there are more righties than lefties in the overall population (as others have noted); we do not know where the left-handers who are painters may sit within the overall "susceptibility" distribution of left-handers. If they all happen to be at the low end of that distribution, they COULD be less susceptible than the overall population, which is made up of all the right handers and all the left handers including the most susceptible ones.

I think that we are supposed to interpret "more frequently" as an absolute statement, not statistical, even though we know that it would be statistical in the real world. Given that interpretation, D is inevitable, and so is the correct answer.
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26 Oct 2008, 15:46
A - The passage only says that left handed people have advantage over right handed people on tasks controlled by right hemisphere of brain.
B - The passage only says that left handed people contract influenza more frequently than right handed.
C - There is no relation between the 2
E - This is an inference that the passage doesn't give.

So D is correct since the inference from the passage would be that left handed painters would be more susceptible to influenza than the rest of the population.
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26 Oct 2008, 22:39
I have a hard time trying to understand OA. How can greater proportion be justified here? Stimulus does not talk of any number or proportion. Suppose, in a population of 100 painters, there are only 5 lefties and 95 righties, how can we say that there will be a greater proportion of lefties?
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26 Oct 2008, 23:29
There's a good reason why you have a hard time understanding the OA: Choice A is not the right answer.
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Re: CR: tough one   [#permalink] 26 Oct 2008, 23:29

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