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The National Association of Fire Fighters says that 45

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The National Association of Fire Fighters says that 45 [#permalink] New post 27 Sep 2003, 10:10
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57% (02:29) correct 43% (02:08) wrong based on 88 sessions
13. The National Association of Fire Fighters says that 45 percent of homes now have smoke detectors, whereas only 30 percent of homes had them 10 years ago. This makes early detection of house fires no more likely, however, because over half of the domestic smoke detectors are either without batteries or else inoperative for some other reason.

In order for the conclusion above to be properly drawn, which one of the following assumptions would have to be made?

(A) Fifteen percent of domestic smoke detectors were installed less than 10 years ago.

(B) The number of fires per year in homes with smoke detectors has increased.

(C) Not all of the smoke detectors in homes are battery operated.

(D) The proportion of domestic smoke detectors that are inoperative has increased in the past ten years.

(E) Unlike automatic water sprinklers, a properly functioning smoke detector cannot by itself increase fire safety in a home.
[Reveal] Spoiler: OA
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Re: The National Association of Fire Fighters says that 45 [#permalink] New post 27 Sep 2003, 11:41
I vote for D. If the proportion of domestic smoke detectors that are inoperative had decreased in the past ten years, then this would have made early detection of house fires more likely.
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Re: The National Association of Fire Fighters says that 45 [#permalink] New post 28 Sep 2003, 10:31
The negation rule really works.
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Re: The National Association of Fire Fighters says that 45 [#permalink] New post 13 Jul 2015, 00:09
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.
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Re: The National Association of Fire Fighters says that 45 [#permalink] New post 13 Jul 2015, 09:19
Expert's post
The National Association of Fire Fighters says that 45 percent of homes now have smoke detectors, whereas only 30 percent of homes had them 10 years ago. This makes early detection of house fires no more likely, however, because over half of the domestic smoke detectors are either without batteries or else inoperative for some other reason.

The conclusion is that smoke detectors are still not effective despite the increase in their prevalence because many of them don't function (due to lack of batteries or other issue).

In order for the conclusion above to be properly drawn, which one of the following assumptions would have to be made?

(A) Fifteen percent of domestic smoke detectors were installed less than 10 years ago.
not relevant
(B) The number of fires per year in homes with smoke detectors has increased.
not relevant
(C) Not all of the smoke detectors in homes are battery operated.
There are also other reasons that they are inoperative.
(D) The proportion of domestic smoke detectors that are inoperative has increased in the past ten years.
If just as many detectors were inoperative in the past, their current inefficacy can't be attributed to malfunction.
(E) Unlike automatic water sprinklers, a properly functioning smoke detector cannot by itself increase fire safety in a home. out of scope
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Re: The National Association of Fire Fighters says that 45   [#permalink] 13 Jul 2015, 09:19
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