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In testing for food allergies, a false positive result

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In testing for food allergies, a false positive result  [#permalink]

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13 Jan 2012, 22:20
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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.

Which of the following, if true, most supports the recommendation that is given above?

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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In testing for food allergies, a false positive result  [#permalink]

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16 Dec 2014, 01:49
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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, he is not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, he is. 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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In testing for food allergies, a false positive result occurs when a p  [#permalink]

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19 Mar 2017, 04:55
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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, he is not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, he is. 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
General Discussion
Senior Manager
Joined: 18 Sep 2009
Posts: 291
Re: Food Allergy  [#permalink]

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14 Jan 2012, 15:11
I will go with option E.
options A,B,C are out of scope.

between D and E

option D said that all tests for food allergies proportion of test that dont give clear result is same. here"clear results" is very vague. It could be positive or negative.

option E wins
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Re: Food Allergy  [#permalink]

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14 Jan 2012, 21:52
1
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 supports the recommendation best.
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Veritas Prep 10 Year Anniversary Promo Question #8  [#permalink]

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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.

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]

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20 Sep 2012, 09:00
2
2

Winner:

geno5

Official 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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Joined: 05 Dec 2011
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Location: Canada
Concentration: Accounting, Finance
GMAT Date: 09-08-2012
GPA: 3
Re: Veritas Prep 10 Year Anniversary Promo Question #8  [#permalink]

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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]

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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]

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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]

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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]

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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]

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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]

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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]

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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]

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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]

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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]

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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]

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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]

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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 &nbs [#permalink] 20 Sep 2012, 09:45

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