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Difficulty:
55%
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Question Stats:
60% (01:41) correct
40%
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wrong
based on 9260
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Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.
(A) a condition when it is present and indicate that there is one
(B) when a condition is present and indicate that there is one
(C) a condition when it is present and indicate that it is present
(D) when a condition is present and indicate its presence
(E) the presence of a condition when it is there and indicate its presence
(A) a condition when it is present and indicate that there is one
(B) when a condition is present and indicate that there is one
(C) a condition when it is present and indicate that it is present
(D) when a condition is present and indicate its presence
(E) the presence of a condition when it is there and indicate its presence
Show Spoilernytimes article
https://www.nytimes.com/1984/07/24/science/the-doctor-s-world-james-fixx-the-enigma-of-heart-disease.html
The advanced equipment needed to screen for heart disease in symptomless individuals is very expensive. Moreover, all medical tests sometimes fail to detect a condition when it is present and indicate it is there when it is not. The percentage of such so-called false negatives and false positives varies with each test. For those and other reasons, most doctors are not inclined to advise use of currently available technology to mass screen for heart disease.
The advanced equipment needed to screen for heart disease in symptomless individuals is very expensive. Moreover, all medical tests sometimes fail to detect a condition when it is present and indicate it is there when it is not. The percentage of such so-called false negatives and false positives varies with each test. For those and other reasons, most doctors are not inclined to advise use of currently available technology to mass screen for heart disease.
04 May 2019, 11:21
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aditliverpoolfc
While it's fine to think about this problem in terms of parallel construction, there's also a simple logic issue here.
Consider two sentences:
- 1. "Jim is tall, and John is not."
2. "Jim has grown, and John is not."
It's not hard to see that the first sentence is fine and the second is nonsense. In #2, ("Jim has grown, and John is not") we're left to wonder: "John is not what? Does he just not exist?"
In #1 ("Jim is tall, and John is not"), we're given an adjective ("tall") in the first part of the sentence, so we know exactly what John is not - the poor guy isn't tall. (And neither am I. I make up for it in other ways, though. I mean: I'm one hell of a good eater.)
Similar issue here. In (B) we have "indicate that there is one, when it is not." Again, we're left to wonder, "when it is not what?" Contrast this with (C) "indicate that it is present, when it is not." Because we have the adjective, "present" in the first clause, it's clear now that the test sometimes indicates that a condition is present, when it is not present. The adjective, lacking in (B), clarifies the meaning in (C).
I hope that helps!
13 Sep 2011, 21:28
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Sorry my answer is wrong. The correct explanation is :-
First, let's think about what the sentence is trying to say without pronouns - it's trying to point out a problem and its obverse: detect a condition when the condition is present vs. indicate that the condition is present when the condition is not present.
A) does a fine job with the first bit (detect a condition when it is present) but messes up the second bit "indicate that there is one when it is not" - indicate there is one what? One condition? It sounds like it's saying something like "one condition exists." The point is to indicate the presence of the condition in a particular circumstance, not its mere existence on the planet.
B) repeats that same error
C) does a fine job with the first bit (detect a condition when it is present) and the second bit (indicate it is present when it is not). Fine.
D) muddies the meaning by moving "when" to the front (B does this too). It sounds like the test just can't detect the timing of the condition, as though, sometimes I have cancer and sometimes I don't and the test can't tell when I do or don't. Really, the test is failing to detect the condition itself, not the timing of the condition. See E for the problem at the end of this choice.
E) "indicate its presence when it is not" is incorrect - that translates as "indicate its presence when it is not presence (last word implied)" which doesn't make any sense. We need to say "indicate that it is present when it is not present (last word implied)." Also "the presence of a condition when it is there" is wordy. "a condition when it is present" is much cleaner.
The source of this Manhattan GMAT forum.
First, let's think about what the sentence is trying to say without pronouns - it's trying to point out a problem and its obverse: detect a condition when the condition is present vs. indicate that the condition is present when the condition is not present.
A) does a fine job with the first bit (detect a condition when it is present) but messes up the second bit "indicate that there is one when it is not" - indicate there is one what? One condition? It sounds like it's saying something like "one condition exists." The point is to indicate the presence of the condition in a particular circumstance, not its mere existence on the planet.
B) repeats that same error
C) does a fine job with the first bit (detect a condition when it is present) and the second bit (indicate it is present when it is not). Fine.
D) muddies the meaning by moving "when" to the front (B does this too). It sounds like the test just can't detect the timing of the condition, as though, sometimes I have cancer and sometimes I don't and the test can't tell when I do or don't. Really, the test is failing to detect the condition itself, not the timing of the condition. See E for the problem at the end of this choice.
E) "indicate its presence when it is not" is incorrect - that translates as "indicate its presence when it is not presence (last word implied)" which doesn't make any sense. We need to say "indicate that it is present when it is not present (last word implied)." Also "the presence of a condition when it is there" is wordy. "a condition when it is present" is much cleaner.
The source of this Manhattan GMAT forum.
I think I just read your previous question too quickly.
