In tests for pironoma, a serious disease, a false positive : GMAT Critical Reasoning (CR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 20 Jan 2017, 02:23

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# In tests for pironoma, a serious disease, a false positive

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 27 May 2009
Posts: 281
Followers: 2

Kudos [?]: 356 [0], given: 18

In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

22 Aug 2009, 06:35
3
This post was
BOOKMARKED
00:00

Difficulty:

(N/A)

Question Stats:

74% (02:09) correct 26% (02:00) wrong based on 146 sessions

### HideShow timer Statistics

87. In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.

Which of the following, if true, gives the most support to the recommendation above?

(A) The accepted treatment for pironoma does not have damaging side effects.
(B) The laboratory test that has the lowest proportion of false positive results causes the same minor side
effects as do the other laboratory tests used to detect pironoma.
(C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of
delay can result in loss of life.
(D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.
(E) All laboratory tests to detect pironoma have the same proportion of false negative results.

[Reveal] Spoiler:
I am not satisfied with the explanation.. OA is E.. I did it first time perhaps and now i am not able to corelate howis it corelating with the argument..pls explain
[Reveal] Spoiler: OA
If you have any questions
New!
Senior Manager
Joined: 29 Jul 2009
Posts: 314
Followers: 4

Kudos [?]: 319 [13] , given: 9

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

22 Aug 2009, 07:23
13
KUDOS
2
This post was
BOOKMARKED
Premise 1: a false positive result indicates that people have pironoma when, in fact, they do not;

Premise 2: a false negative result indicates that people do not have pironoma when, in fact, they do.

Conclusion: To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of
false positive results.

The conclusion that the author draws is unexpected because we should look for laboratories that have the lowest proportion of false negative results. However, the questions is asking for an answer choice that strengthens the argument.

Option E says that all the laboratories have the same proportion of false negative results. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

Consider the following example

Height is the most important feature for a basketball player, whereas speed is the second one. However, Richard is the best player in his team because he is the fastest.

What would make this conclusion be properly drawn?

All the players in Richard's team have the same height.

Last edited by mikeCoolBoy on 23 Aug 2009, 00:14, edited 1 time in total.
Manager
Status: Berkeley Haas 2013
Joined: 23 Jul 2009
Posts: 191
Followers: 1

Kudos [?]: 38 [0], given: 16

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

22 Aug 2009, 07:59
mikeCoolBoy wrote:
Premise 1: a false positive result indicates that people have pironoma when, in fact, they do not;

Premise 2: a false negative result indicates that people do not have pironoma when, in fact, they do.

Conclusion: To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of
false positive results.

The conclusion that the author draws is unexpected because we should look for laboratories that have the lowest proportion of false negative results. However, the questions is asking for an answer choice that strengthens the argument.

Option E says that all the laboratories have the same proportion of false negative. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

Consider the following example

Height is the most important feature for a basketball player, whereas speed is the second one. However, Richard is the best player in his team because he is the fastest.

What would make this conclusion be properly drawn?

All the players in Richard's team have the same height.

Perfect. +1 for ya
Director
Joined: 01 Apr 2008
Posts: 897
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 28

Kudos [?]: 645 [0], given: 18

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

22 Aug 2009, 09:48
1
This post was
BOOKMARKED
In other words,
X and Y are two scenarios/situations that affect a conclusion.

When can we say that the conclusion depends ONLY on how X varies?
=>Only when Y is constant or when it varies proportionately we can say that the conclusion entirely depends on how X varies.
Senior Manager
Joined: 27 May 2009
Posts: 281
Followers: 2

Kudos [?]: 356 [0], given: 18

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

22 Aug 2009, 23:18
mikeCoolBoy wrote:
Option E says that all the laboratories have the same proportion of false negative. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

All the players in Richard's team have the same height.

Economist wrote:
In other words,
X and Y are two scenarios/situations that affect a conclusion.

When can we say that the conclusion depends ONLY on how X varies?
=>Only when Y is constant or when it varies proportionately we can say that the conclusion entirely depends on how X varies.

But if the lowest proportion of false positive results are to be selected how can we say strengthen it by saying all have the same proportion. IF it is the case we can not select th lowest coz all are the same. ..

Pls let me know what i am missing on?
Senior Manager
Joined: 29 Jul 2009
Posts: 314
Followers: 4

Kudos [?]: 319 [1] , given: 9

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

23 Aug 2009, 00:13
1
KUDOS
rohansherry wrote:
mikeCoolBoy wrote:
Option E says that all the laboratories have the same proportion of false negative. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

All the players in Richard's team have the same height.

Economist wrote:
In other words,
X and Y are two scenarios/situations that affect a conclusion.

When can we say that the conclusion depends ONLY on how X varies?
=>Only when Y is constant or when it varies proportionately we can say that the conclusion entirely depends on how X varies.

But if the lowest proportion of false positive results are to be selected how can we say strengthen it by saying all have the same proportion. IF it is the case we can not select th lowest coz all are the same. ..

Pls let me know what i am missing on?

watch out

all laboratories have the same proportion of FALSE NEGATIVE RESULTS NOT FALSE POSITIVE RESULTS
Senior Manager
Joined: 27 May 2009
Posts: 281
Followers: 2

Kudos [?]: 356 [0], given: 18

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

23 Aug 2009, 00:16
mikeCoolBoy wrote:
rohansherry wrote:
mikeCoolBoy wrote:
Option E says that all the laboratories have the same proportion of false negative. If all have the same proportion, then the one with the lowest proportion of false positive results would be the best.

All the players in Richard's team have the same height.

Economist wrote:
In other words,
X and Y are two scenarios/situations that affect a conclusion.

When can we say that the conclusion depends ONLY on how X varies?
=>Only when Y is constant or when it varies proportionately we can say that the conclusion entirely depends on how X varies.

But if the lowest proportion of false positive results are to be selected how can we say strengthen it by saying all have the same proportion. IF it is the case we can not select th lowest coz all are the same. ..

Pls let me know what i am missing on?

watch out

all laboratories have the same proportion of FALSE NEGATIVE RESULTS NOT FALSE POSITIVE RESULTS

Thanks mike Kudos to you
Senior Manager
Joined: 29 Jul 2009
Posts: 314
Followers: 4

Kudos [?]: 319 [0], given: 9

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

23 Aug 2009, 00:39
you're welcome.
Manager
Joined: 14 Dec 2008
Posts: 169
Followers: 1

Kudos [?]: 24 [0], given: 39

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

05 Oct 2009, 23:30
well explained mikeCoolBoy, even I was very confused with the options.
Manager
Joined: 30 Sep 2009
Posts: 58
Followers: 1

Kudos [?]: 26 [0], given: 6

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

06 Oct 2009, 11:19
I got it this way....
Since none of the labs have a chance of saying the negative results perfectly, the only one who would atleast test the positive results closest should be chosen, sorta elimination for the labs given all other criterion being equal
Intern
Joined: 03 Oct 2009
Posts: 38
Schools: NY Stern; Columbia; Cornell; Waterloo; U of T
Followers: 0

Kudos [?]: 6 [0], given: 8

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

06 Oct 2009, 14:18
Uupppsss...

Was going over my antena. Thanks to everyone of the contributors!
Intern
Joined: 18 Sep 2009
Posts: 9
Followers: 1

Kudos [?]: 1 [0], given: 1

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

22 Oct 2009, 22:02
Manager
Joined: 21 Aug 2012
Posts: 210
Concentration: General Management, Operations
Schools: HBS '19 (S)
GMAT 1: 740 Q49 V42
Followers: 0

Kudos [?]: 29 [0], given: 349

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

12 Jan 2013, 21:16
was really tough ... thanks for explanantion ...
GMAT Club Legend
Joined: 01 Oct 2013
Posts: 10534
Followers: 919

Kudos [?]: 203 [0], given: 0

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

13 Dec 2014, 07:29
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
GMAT Club Legend
Joined: 01 Oct 2013
Posts: 10534
Followers: 919

Kudos [?]: 203 [0], given: 0

Re: In tests for pironoma, a serious disease, a false positive [#permalink]

### Show Tags

01 Sep 2016, 13:12
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: In tests for pironoma, a serious disease, a false positive   [#permalink] 01 Sep 2016, 13:12
Similar topics Replies Last post
Similar
Topics:
22 In tests for pironoma, a serious disease, a false positive 6 24 Aug 2012, 02:46
5 In tests for pironoma, a serious disease, a false positive 9 14 Apr 2011, 22:36
2 In tests for pironoma, a serious disease, a false positive 5 13 Mar 2011, 18:53
15 In tests for pironoma, a serious disease, a false positive 16 20 Jan 2010, 07:25
In tests for pironoma, a serious disease, a false positive 0 14 Jul 2008, 20:48
Display posts from previous: Sort by