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# Guidebook writer: I have visited hotels throughout the

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Guidebook writer: I have visited hotels throughout the [#permalink]

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14 Jul 2010, 08:11
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Guidebook writer: I have visited hotels throughout the country and have noticed that in those built before 1930
the quality of the original carpentry work is generally superior to that in hotels built afterward. Clearly carpenters
working on hotels before 1930 typically worked with more skill, care, and effort than carpenters who have
worked on hotels built subsequently.

Which of the following, if true, most seriously weakens the guidebook writer’s argument?

(A) The quality of original carpentry in hotels is generally far superior to the quality of original carpentry in
other structures, such as houses and stores.
(B) Hotels built since 1930 can generally accommodate more guests than those built before 1930.
(C) The materials available to carpenters working before 1930 were not significantly different in quality from
the materials available to carpenters working after 1930.
(D) The better the quality of original carpentry in a building, the less likely that building is to fall into disuse and
be demolished.
(E) The average length of apprenticeship for carpenters has declined significantly since 1930.

can someone pls explain y E is not correct...
since avg apprenticeship decreases-> carpenter less skilled before becoming full fledged carpenter ->after 1930 carpenters less skillful
[Reveal] Spoiler: OA
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14 Jul 2010, 14:08
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E strengthens the argument, but we need to find statement that weakens it the most....
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14 Jul 2010, 16:17
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14 Jul 2010, 22:07
E strengthens the argument..coz declined avg length of apprenticeship is the reason why carpenters working in hotels after 1930 work with less skill, care..

D weakens
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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05 Dec 2012, 21:43
B shows that there is another reason which make the carpenter in the hotel bult after 1930 bad

clearly B is also a weakener.

pls help
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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06 Dec 2012, 21:52
Premise: Carpentry in hotels built before 1930 were of better quality than that in hotels build afterwards.
Conclusion: Carpenters after 1930 worked with more Skill, Care and Efforts than those before.

To weaken the conclusion, you should be able to prove that carpentry before 1930 was good because of some different reasons than the factors of skill and care.

Option (E) tells that period of apprenticeship was longer before 1930. It means that carpentry was done with some more care and cautiousness. Still you cannot argue against the factors of skill, care, effort. Even if option (E) is correct, I can say that Workers after 1930 worked carelessly. Hence this option doesn't weaken the conclusion.

If you consider option (D), the whole reasoning turns to be baseless. If superior carpentry is vulnerable to disuse and demolition, then good carpentry is nowhere because it is being destroyed, Not because worker before 1930 were more careful.
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Guidebook writer: I have visited hotels throughout the [#permalink]

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25 Jan 2015, 19:39
(D) This is a self selection bias situation. The hotels which had superior carpentry are the ones that survived. Its not the carpenters that were better than the ones from later period, the buildings with better carpentry stayed and the rest were demolished leading to a larger portion of 1930 or older buildings with good carpentry.
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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25 Jan 2015, 21:03
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Option D does not impact the two groups of hotels in the same way: this preservational bias will be stronger the older the hotel. Shoddy buildings that are new are more likely to be standing than are those that are old, as the former will be demolished once they get older.

As for B, how does this difference influence the quality of the original carpentry work.

The lesson to be learned from this question: be wary of studies and surveys; ensure that the sample is representative of the population in question.

Imagine that there were a study of men grouped according to their ages, (A) over 90 , (B) close to 65, (C) close to 30. If it were found that, on average, the blood of the A men contained more a certain protein than did the blood of the B men, who in turn contained more of this protein than did the blood of the C men, would it be safe to conclude that the amount of this protein in a man's blood tends to increase as the man ages ?
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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05 Feb 2015, 22:45
I choose D as it clearly states that irrespective of whether the hotel was built before or after 1930. If the carpentry is good there are high chances that building will be in use. Hence, hotel staff will be taking care of its belongings.
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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17 Mar 2015, 04:11
Choice D

Type weaken

Conclusion: skill, care and effort of carpenter => superior quality of building prior 1930
Assumption: skill, care and effort are the only cause of the conclusion

Beak the assumption: there are other reason lead to superior quality of building prior 1930 (namedly: all the the building wih inferior carpentry has been demoslished for other uses). Hence choice D is correct
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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06 Jun 2016, 10:26
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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06 Jun 2016, 13:45
to weaken an argument you need not necessarily invalidate the conclusion but also find an alternative reason that leads to the conclusion such as option D which means it is not about skill of the carpenters rather the intent to ensure the buildings are not disused and demolished that lead to superior work.
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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30 Sep 2016, 14:24
Well, I think D is correct because the representative sample of two hotels is not the same.
If good ones stay ( old hotels) then you are comparing only good ones with bad as well as good ones ( new hotels), which is not a fair comparision.
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Re: Guidebook writer: I have visited hotels throughout the [#permalink]

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30 Sep 2016, 23:46
D is indirectly weakening the conclusion

Author concludes saying "before 1930, more care and skill is taken to build hotels"

Option D is saying "If quality is good, it is used more and hence the building build after 1930 is more destroyed because they are used more because of its superior quality"
Re: Guidebook writer: I have visited hotels throughout the   [#permalink] 30 Sep 2016, 23:46
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