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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
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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.

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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 11:02
bb wrote:
[textarea]

Veritas Prep 10 Year Anniversary Promo Question #8 Critical Reasoning




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 ______________________.

[audilamb] - The argument defines a false positive as an indication for a food allergy when infact there isn't one. This would result in taking precautions/medication that wouldn't be necessary. In other words no harm is done to the patient by taking these precautions.
A false negative occurs when a patient is actually allergic to a type of food but the test doesn't indicate this. This leads to a patient not taking any precautions and or medication which could lead to an allergic reaction when the food is consumed.


(A) Some food allergies cause reactions severe enough to be life-threatening.
[audilamb] - This clearly agrees with the analysis done above and hence a physician wants a test with the smallest % of false negatives as it is better to be safe than sorry. In other words, a physician would rather ask the patient to avoid a food group when he/she is not allergic (false positive) rather than cause a life threatening reaction due to relying on a false negative result

(B) None of the tests for food allergies have lasting side effects.
[audilamb] - Out of scope. The argument doesn't mention the side effects of the test itself.

(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.
[audilamb] - Irrelevant. The argument is concerned with false negatives and C indicates that a positive or false positive has been detected.

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies.
[audilamb] - Irrelevant. You would just repeat the test until you get a clear result. D doesn't address false negatives

(E) All tests for food allergies have the same proportion of false positive results.
[audilamb] - It is OK to have more false positives according to my analysis mentioned above. You should be worried about false negatives.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 11:54
.

Last edited by igloo on 21 Sep 2012, 06:11, edited 1 time in total.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 13:07
The answer should be E, as it gives a comparison between positive and negative tests...going with the tone of the statement
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 22:08
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.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 23:02
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.

Analysis of passage: False positive results occur when a non-allergic person is falsely identified as allergic and a false negative result occurs when an allergic person is not identified as allergic.

Best answer is the one which expresses the importance false negative result as we should be concerned about the allergic person and therefore, to most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results because some food allergies cause reactions severe enough to be life threatening.

Hence answer is A.

Analysis of other answer choices:

B: If none of the tests have lasting side effects, the false negative or false positive results will be irrelevant.

C.: It talks about other undiscovered food allergies, which is irrelevant in the context.

D. We are not concerned about proportion of tests that do not provide a clear result because some severe allergies are required to be identified to enable physician to treat the patient.

E.: All tests for food allergies have the same proportion of false positive results but how the physician is going to most accurately determine the food allergies.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 20 Sep 2012, 23:45
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.

(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:E , because to most accurately determine food allergies. You should have minimum of both false positive and false negative tests. As conclusion says "most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results" so the assumption is false positive tests have same proportion or it can't be improved. That's what E says
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 21 Sep 2012, 01:37
Answer E.
the premise -

1. Every type of Food allergy tests result in --> false positive & false negative

the conclusion -
2. A test with low of false negative % should be selected.

Reasoning -

Each test has two types of result sets (false +ve & false -ve ) and hence choosing the test will be based on the ratio of both the results. As the conclusion only talks about false negative we can not conclude whether the test with low false -ve is the best or not until we know the proportion of false +ve.

Or else - if we know that all tests will give the same % of False +ve then we can conclude that the test with low false -ve should be chosen.

lets see what each answer choice say-


(A) Some food allergies cause reactions severe enough to be life-threatening. - There is no mention of life-threat in the premise / Out of scope

(B) None of the tests for food allergies have lasting side effects. - There is no mention of duration of side effects / Out of scope

(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. - no mention of other food allergies in the premise / out of scope

(D) The proportion of tests that do not provide a clear result is the same for all tests of food allergies. - there is no mention of in conclusive results / Out of scope

(E) All tests for food allergies have the same proportion of false positive results. - Best answer
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 21 Sep 2012, 02:35
Answer is E

Reason: All tests same proportion of positive result means the doctor should choose the test with lowest false negative result.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 21 Sep 2012, 02:38
Answer E

Since all the tests have same proportion of false positive result, so in order to determine the most accurate test results, physicians should use the test that gives the smallest percentage of false negative results.

I just tried to fit the answer choice in the argument.

Last edited by bijoydinanath on 21 Sep 2012, 03:18, edited 1 time in total.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 21 Sep 2012, 02:49
E

Since all tests for food allergies have the same proportion of false positive results, only smallest percentage of false negative results will give the most accurate result.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 21 Sep 2012, 07:37
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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.


Winner of the contest is geno5

Here is the OE

[Reveal] Spoiler:
Solution: 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 21 Sep 2012, 08:17
:-D Thanks, BB and Veritas Gmatclub is great! Do not know what I would do without it! Good luck to todays contestants.
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 21 Sep 2012, 08:24
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 21 Sep 2012, 11:44
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Re: Veritas Prep 10 Year Anniversary Promo Question #8 [#permalink] New post 18 Feb 2014, 07:35
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Re: Veritas Prep 10 Year Anniversary Promo Question #8   [#permalink] 18 Feb 2014, 07:35
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