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Veritas Prep 10 Year Anniversary Promo Question #8

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Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:00
Expert's post
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

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46% (02:12) correct 54% (01:22) wrong based on 115 sessions

Veritas Prep 10 Year Anniversary Promo Question #8 Critical Reasoning


One quant and one verbal question will be posted each day starting on Monday Sept 17th at 10 AM PST/1 PM EST and the first person to correctly answer the question and show how they arrived at the answer will win a free Veritas Prep GMAT course ($1,650 value). Winners will be selected and notified by a GMAT Club moderator. For more questions and details please check here: veritas-prep-10-year-anniversary-giveaway-138806.html

To participate, please make sure you provide the correct answer (A,B,C,D,E) and explanation that clearly shows how you arrived at it.
Winners will be announced the following day at 10 AM Pacific/1 PM Eastern Time.

Good Luck! May the best and fastest win!


Which of the following best completes the passage below:
In testing for food allergies, a false positive result occurs when a person is said to be allergic to a particular food when, in fact, they are not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, they are. To most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results because ______________________.

(A) Some food allergies cause reactions severe enough to be life-threatening.

(B) None of the tests for food allergies have lasting side effects.

(C) In diagnosing food allergies it is important to be as thorough as possible, since most people with one known food allergy have other undiscovered food allergies.

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies.

(E) All tests for food allergies have the same proportion of false positive results.

[Reveal] Spoiler: OA & Explanation
Answer is E

This question illustrates a couple of critical concepts for Critical Reasoning. First it introduces you to the "Best Completes the Passage" format, in which you need to infer the question stem from the language immediately preceding the underlined portion-to-be-completed. Here that word is "because", which seeks evidence for a conclusion. And that conclusion is "in order to most accurately determine food allergies, doctors should use the test with the smallest percentage of false negatives". The goal in this question is clearly to strengthen that conclusion.

With this in mind, you are now set up for another common trap- one in which the author of the question knows where your mind wants to go, and baits you in that direction. When you think of an allergy (or really any medical) diagnosis, what is your biggest fear? Probably that the doctor will miss a diagnosis and allow you to continue with a risky behavior that could negatively affect your quality of life. Say, for example, that you are allergic to peanuts, but your doctor falsely (false negative) says that you're not. Your next peanut butter sandwich could be catastrophic! On the flip side, if the doctor tells you that you are allergic to peanuts when it turns out you're not, that's more of an inconvenience than anything. It's a bummer to not enjoy Reese's peanut butter cups, but it's not life-threatening.

So, naturally, your mind wants to minimize false negatives, to err on the side of safety. But what's the conclusion? To most accurately (not most safely!) determine allergies, you should eliminate false negatives. For this specific objective, false positives are just as detrimental as false negatives – each is inaccurate. And so the correct answer needs to give you some reason why you are only focusing on false negatives if the goal is accuracy. Choice E, which does not bear on safety (but neither does the conclusion) is correct, as it shows that false positives will be the same for each test, so the only way to become more accurate is to minimize false negatives.
[Reveal] Spoiler: OA

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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:00
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Answer is E

This question illustrates a couple of critical concepts for Critical Reasoning. First it introduces you to the "Best Completes the Passage" format, in which you need to infer the question stem from the language immediately preceding the underlined portion-to-be-completed. Here that word is "because", which seeks evidence for a conclusion. And that conclusion is "in order to most accurately determine food allergies, doctors should use the test with the smallest percentage of false negatives". The goal in this question is clearly to strengthen that conclusion.

With this in mind, you are now set up for another common trap- one in which the author of the question knows where your mind wants to go, and baits you in that direction. When you think of an allergy (or really any medical) diagnosis, what is your biggest fear? Probably that the doctor will miss a diagnosis and allow you to continue with a risky behavior that could negatively affect your quality of life. Say, for example, that you are allergic to peanuts, but your doctor falsely (false negative) says that you're not. Your next peanut butter sandwich could be catastrophic! On the flip side, if the doctor tells you that you are allergic to peanuts when it turns out you're not, that's more of an inconvenience than anything. It's a bummer to not enjoy Reese's peanut butter cups, but it's not life-threatening.

So, naturally, your mind wants to minimize false negatives, to err on the side of safety. But what's the conclusion? To most accurately (not most safely!) determine allergies, you should eliminate false negatives. For this specific objective, false positives are just as detrimental as false negatives – each is inaccurate. And so the correct answer needs to give you some reason why you are only focusing on false negatives if the goal is accuracy. Choice E, which does not bear on safety (but neither does the conclusion) is correct, as it shows that false positives will be the same for each test, so the only way to become more accurate is to minimize false negatives.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:03

WINNING ANSWER!!!!
CONGRATULATIONS. YOU WIN YOURSELF A SHINY NEW VERITAS FLAGSHIP PREP COURSE.



bb wrote:

Veritas Prep 10 Year Anniversary Promo Question #8 Critical Reasoning


One quant and one verbal question will be posted each day starting on Monday Sept 17th at 10 AM PST/1 PM EST and the first person to correctly answer the question and show how they arrived at the answer will win a free Veritas Prep GMAT course ($1,650 value). Winners will be selected and notified by a GMAT Club moderator. For more questions and details please check here: veritas-prep-10-year-anniversary-giveaway-138806.html

To participate, please make sure you provide the correct answer (A,B,C,D,E) and explanation that clearly shows how you arrived at it.
Winners will be announced the following day at 10 AM Pacific/1 PM Eastern Time.

Good Luck! May the best and fastest win!


Which of the following best completes the passage below:
In testing for food allergies, a false positive result occurs when a person is said to be allergic to a particular food when, in fact, they are not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, they are. To most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results because ______________________.

(A) Some food allergies cause reactions severe enough to be life-threatening.

(B) None of the tests for food allergies have lasting side effects.

(C) In diagnosing food allergies it is important to be as thorough as possible, since most people with one known food allergy have other undiscovered food allergies.

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies.

(E) All tests for food allergies have the same proportion of false positive results.


E.
A. Irrelevant
B. Irrelevant
C. It may be important but we dont know they have other allergiees
D. If it were the same why would it matter.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:03
Ans is A
Allergy can be life threatening, and therefore these tests should be accurate.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:05
Option A.
Some food allergies cause reactions severe enough to be life-threatening
Because its life threatening and that is purpose of the test to find.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:05
E is the correct answer because you want a test that gives you the smallest percentage for both false positive and false negative.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:05
bb wrote:

Veritas Prep 10 Year Anniversary Promo Question #8 Critical Reasoning


One quant and one verbal question will be posted each day starting on Monday Sept 17th at 10 AM PST/1 PM EST and the first person to correctly answer the question and show how they arrived at the answer will win a free Veritas Prep GMAT course ($1,650 value). Winners will be selected and notified by a GMAT Club moderator. For more questions and details please check here: veritas-prep-10-year-anniversary-giveaway-138806.html

To participate, please make sure you provide the correct answer (A,B,C,D,E) and explanation that clearly shows how you arrived at it.
Winners will be announced the following day at 10 AM Pacific/1 PM Eastern Time.

Good Luck! May the best and fastest win!


Which of the following best completes the passage below:
In testing for food allergies, a false positive result occurs when a person is said to be allergic to a particular food when, in fact, they are not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, they are. To most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results because ______________________.

(A) Some food allergies cause reactions severe enough to be life-threatening.

(B) None of the tests for food allergies have lasting side effects.

(C) In diagnosing food allergies it is important to be as thorough as possible, since most people with one known food allergy have other undiscovered food allergies.

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies.

(E) All tests for food allergies have the same proportion of false positive results.



(C) because atleast the diagnosis will help for the cure and prevention of disease.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:05
IMO E.
This option explains why tests with false positive results can be ignored.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:05
the answer has to be E.
Because false positive results cannot be used for identification. negation test proves this.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:06
Answer is A, since false negative result can be life threatening to a person.
B,C,D,E are not properly strengthening & concluding the passage and are nor relevant to context.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:07
bb wrote:

Veritas Prep 10 Year Anniversary Promo Question #8 Critical Reasoning


One quant and one verbal question will be posted each day starting on Monday Sept 17th at 10 AM PST/1 PM EST and the first person to correctly answer the question and show how they arrived at the answer will win a free Veritas Prep GMAT course ($1,650 value). Winners will be selected and notified by a GMAT Club moderator. For more questions and details please check here: veritas-prep-10-year-anniversary-giveaway-138806.html

To participate, please make sure you provide the correct answer (A,B,C,D,E) and explanation that clearly shows how you arrived at it.
Winners will be announced the following day at 10 AM Pacific/1 PM Eastern Time.

Good Luck! May the best and fastest win!


Which of the following best completes the passage below:
In testing for food allergies, a false positive result occurs when a person is said to be allergic to a particular food when, in fact, they are not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, they are. To most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results because ______________________.

(A) Some food allergies cause reactions severe enough to be life-threatening.

(B) None of the tests for food allergies have lasting side effects.

(C) In diagnosing food allergies it is important to be as thorough as possible, since most people with one known food allergy have other undiscovered food allergies.

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies.

(E) All tests for food allergies have the same proportion of false positive results.


My ans is E
A physician should use the test that gives the smallest percentage of false negative results because the differentiation cannot be based on positive results as all tests for food allergies have the same proportion of false positive results.Hence E seems to be the best
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:08
bb wrote:

Veritas Prep 10 Year Anniversary Promo Question #8 Critical Reasoning


One quant and one verbal question will be posted each day starting on Monday Sept 17th at 10 AM PST/1 PM EST and the first person to correctly answer the question and show how they arrived at the answer will win a free Veritas Prep GMAT course ($1,650 value). Winners will be selected and notified by a GMAT Club moderator. For more questions and details please check here: veritas-prep-10-year-anniversary-giveaway-138806.html

To participate, please make sure you provide the correct answer (A,B,C,D,E) and explanation that clearly shows how you arrived at it.
Winners will be announced the following day at 10 AM Pacific/1 PM Eastern Time.

Good Luck! May the best and fastest win!


Which of the following best completes the passage below:
In testing for food allergies, a false positive result occurs when a person is said to be allergic to a particular food when, in fact, they are not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, they are. To most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results because ______________________.

(A) Some food allergies cause reactions severe enough to be life-threatening.

(B) None of the tests for food allergies have lasting side effects.

(C) In diagnosing food allergies it is important to be as thorough as possible, since most people with one known food allergy have other undiscovered food allergies.

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies.

(E) All tests for food allergies have the same proportion of false positive results.




Ans : C
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:09
My answer is E
Because All tests for food allergies have the same proportion of false positive results -> "smallest percentage of false negative results" give most accurate result
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:10
Answer is B as even a small number of false negative can be significant if the allergy is dangerous, hence even a small mistake should not cause any major issues. The number of mistakes also depend on the sample size. This is related to a Veritas Prep CR article recently published.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:13
The answer is E.

The passage talks about two possible unwanted results of test results: false positives and false negatives. It then goes on to say that the tests with the lowest percentage of false negatives should be chosen and the most logical way of completing the passage considering the option would be if the percentage of false positive is consistent among the different tests and therefore cant the deciding factor.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:45
Which of the following best completes the passage below:
In testing for food allergies, a false positive result occurs when a person is said to be allergic to a particular food when, in fact, they are not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, they are. To most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results because ______________________.


(A) Some food allergies cause reactions severe enough to be life-threatening. This option is non relevant because does not explain why a physician should use the test that gives the smallest percentage of false negative results

(B) None of the tests for food allergies have lasting side effects.- Again this is out of scope...the argument is not talking about this.

(C) In diagnosing food allergies it is important to be as thorough as possible, since most people with one known food allergy have other undiscovered food allergies.- it may create confusion but this is talking about a different reasoning than what is given in the argument

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies. This is quite close but will not be a answer because it is not talking about all tests

(E) All tests for food allergies have the same proportion of false positive results. this is the answer

E
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 09:58
OA is A.
False Negative result means the person is allergic but tested negative which means he can consume allergic food which could be life threatening.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 10:09
Correct answer is E.

Goal -> To accurately determine food allergies

Plan -> physician must choose a test that gives a smallest % of false negative results.

Conclusion -> To achieve our goal, we must implement the above mentioned plan.

Conclusion indicates accurate determination of food allergies has something to do with false negative results.That is , it is not depending on false positive results.

As per the scope of the argument -> food allergy test may depend on false positive and false negative results and not on any other results.

Any statement, that confirms false positive results are not used/ need not be considered & only false negative reports are used to achieve the goal (to accurately determine food allergies) is the correct answer.

a. Talks abouts effects of food allergies, we require something about false negative results and how they can help in accurately determining the food allergy . Hence it doesnot effect the conclusion.

b. Here too, we are not concerned with the side effects of tests. This does not help us in accurately determining food allergy.Hence it doesnot effect the conclusion

d. proportion of unclear results doesnot give us any info about false poitive or false negative results. Without those, we cannot accurately determine the food allergies.

c. May be ! lets see in detail

This answer choice if taken as true means, most people have undiscovered allergies, so they are not aware of some of their own undiscovered allergies and hence may say they are not allergic to a particular food, where as they actually are allergic to that food. So they generate a false negative result. Most people are not aware of their own undiscovered allergies, so most people generate High number of false negative reports. But the answe choice says "It is important to be thorough" , so if people have information about their undiscovered allergies, they will not generate a false negative report. Seems good !

But wait, does it tell anything about " false postive results are not required / not considered " No !


we are left out E -> So, E is the correct answer !. Lets see how !

Tests consist of only flase positive and false negative results as per the argument. The answer choice says false positive results are constant across all tests. This means only false negatives help in determining the accuracy !.

Now say we have test 1 and test 2

test 1 - 10 false positive results and 3 false negative results
test 2 - 10 false positive results (since false positive result remain constant) and 7 false negative results.

Clearly test2 has low num of false negative results and more accurately determines the food allergy ! This supports our conclusion !

We can confirm this by negations .

Not all tests for food allergies have same proportions of false positive results. This means determining the accuracy of food allergy depends on both false positive and negative results. This breaks our conclusion which says accuracy depends only on false negative results. Since it breaks the conclusion on negation, this is the correct answer !

Last edited by igloo on 21 Sep 2012, 06:15, edited 3 times in total.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 10:16
I will choose option E.

Which of the following best completes the passage below:
In testing for food allergies, a false positive result occurs when a person is said to be allergic to a particular food when, in fact, they are not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, they are. To most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results because ______________________.

(A)Some food allergies cause reactions severe enough to be life-threatening. - This may be true but irrelevent to the question

(B) None of the tests for food allergies have lasting side effects. - The question is not about the effects or side effects - irrelevent

(C) In diagnosing food allergies it is important to be as thorough as possible, since most people with one known food allergy have other undiscovered food allergies. - test is about finding the allergy only - other way to say the presmises.

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies. - if this is true than there is no such test with smallest percentage of false negative results.

(E) All tests for food allergies have the same proportion of false positive results.[/quote] - Looks okay. if test has equal proportions of positive and negative, choose test which gives smaller %age of false negative.

OA Please?
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 10:25
Answer is E , if the false positives are all same level , the test with least false negative will be the most accurate
Re: Veritas Prep 10 Year Anniversary Promo Question #8   [#permalink] 20 Sep 2012, 10:25
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