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# The National Association of Fire Fighters says that 45

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VP
Joined: 15 Jul 2004
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The National Association of Fire Fighters says that 45 [#permalink]

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15 Aug 2006, 22:38
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0% (00:00) correct 0% (00:00) wrong based on 1 sessions

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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.

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Current Student
Joined: 29 Jan 2005
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15 Aug 2006, 23:06
Statistically, (D) is plausible here.

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CEO
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16 Aug 2006, 00:51
Yes this is D.

Negate D and argument falls.
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Director
Joined: 10 Oct 2005
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16 Aug 2006, 11:31
D is a clear cut choice

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Manager
Joined: 16 Aug 2006
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16 Aug 2006, 11:39
D it is.

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Senior Manager
Joined: 07 Apr 2006
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16 Aug 2006, 12:29
Looks like D to me...what is OA?

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Senior Manager
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16 Aug 2006, 22:24
Agree with the rest D seems most logical...

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VP
Joined: 15 Jul 2004
Posts: 1439

Kudos [?]: 218 [0], given: 13

Schools: Wharton (R2 - submitted); HBS (R2 - submitted); IIMA (admitted for 1 year PGPX)

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17 Aug 2006, 09:59
D is the OA.

Matt could you explain a bit more.. I had chosen E. Even though was appeaering horrible and by POE, only D comes close yet the logic beats me.

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Director
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17 Aug 2006, 11:33
E is out of scope here.

Though D is so close to me, I also support B.

Can anyone explain why B is wrong in this case.

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Senior Manager
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17 Aug 2006, 13:48
B talks about the number of fires, not the number of fires that are detected. You can't be certain abt B.
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Current Student
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17 Aug 2006, 20:26
dwivedys wrote:
D is the OA.

Matt could you explain a bit more.. I had chosen E. Even though was appeaering horrible and by POE, only D comes close yet the logic beats me.

On assumption questions be on the lookout for extreme answer choices.

"Cannot" in E is a clear red flag, so I nixed it immediately.

Disclaimer: This is not always the case, but true about 95% of the time.

(D) makes sense if you set up the problem like a standard PS and do the straightforward math.

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VP
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18 Aug 2006, 00:17
D looked good

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SVP
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18 Aug 2006, 00:23
D looks good.

even though the number of houses with smoke detectors has increased, but since the number of inoperative soke detectors have increased too, the likelihood of early detection is less.

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18 Aug 2006, 00:23
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