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# Y has been believed to cause Z. A new report, noting that Y

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Manager
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Y has been believed to cause Z. A new report, noting that Y [#permalink]

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04 Aug 2008, 11:30
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45% (medium)

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85% (01:43) correct 15% (01:07) wrong based on 17 sessions

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Y has been believed to cause Z. A new report, noting that Y and Z are often observed to be preceded by X, suggests that X, not Y, may be the cause of Z.
Which of the following further observations would best support the new report’s suggestion?
(A) In cases where X occurs but Y does not, X is usually followed by Z.
(B) In cases where X occurs, followed by Y, Y is usually followed by Z.
(C) In cases where Y occurs but X does not, Y is usually followed by Z.
(D) In cases where Y occurs but Z does not, Y is usually preceded by X.
(E) In cases where Z occurs, it is usually preceded by X and Y.
[Reveal] Spoiler: OA
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Re: Y has been believed to cause Z. A new report, noting that Y [#permalink]

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04 Aug 2008, 13:13
lordw wrote:
Y has been believed to cause Z. A new report, noting that Y and Z are often observed to be preceded by X, suggests that X, not Y, may be the cause of Z.
Which of the following further observations would best support the new report’s suggestion?
(A) In cases where X occurs but Y does not, X is usually followed by Z.
(B) In cases where X occurs, followed by Y, Y is usually followed by Z.
(C) In cases where Y occurs but X does not, Y is usually followed by Z.
(D) In cases where Y occurs but Z does not, Y is usually preceded by X.
(E) In cases where Z occurs, it is usually preceded by X and Y.

I would go w/ A.
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Re: Y has been believed to cause Z. A new report, noting that Y [#permalink]

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04 Aug 2008, 13:20
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lordw wrote:
Y has been believed to cause Z. A new report, noting that Y and Z are often observed to be preceded by X, suggests that X, not Y, may be the cause of Z.
Which of the following further observations would best support the new report’s suggestion?
(A) In cases where X occurs but Y does not, X is usually followed by Z. -> says in the absense of Y Z occurs
(B) In cases where X occurs, followed by Y, Y is usually followed by Z. ->weakens
(C) In cases where Y occurs but X does not, Y is usually followed by Z. -> this opposes the suggestion
(D) In cases where Y occurs but Z does not, Y is usually preceded by X. -> thsi is irrelevant
(E) In cases where Z occurs, it is usually preceded by X and Y. -> does not say Y does not cause Z

To prove : X not Y causes Z

hence (A) is apt for this proof
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Re: Y has been believed to cause Z. A new report, noting that Y [#permalink]

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04 Aug 2008, 15:51
A pour moi
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Re: Y has been believed to cause Z. A new report, noting that Y [#permalink]

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04 Aug 2008, 15:59
IMO A
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Re: Y has been believed to cause Z. A new report, noting that Y [#permalink]

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04 Aug 2008, 21:53
lordw wrote:
Y has been believed to cause Z. A new report, noting that Y and Z are often observed to be preceded by X, suggests that X, not Y, may be the cause of Z.
Which of the following further observations would best support the new report’s suggestion?
(A) In cases where X occurs but Y does not, X is usually followed by Z.
(B) In cases where X occurs, followed by Y, Y is usually followed by Z.
(C) In cases where Y occurs but X does not, Y is usually followed by Z.
(D) In cases where Y occurs but Z does not, Y is usually preceded by X.
(E) In cases where Z occurs, it is usually preceded by X and Y.

IMO A)
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Re: Y has been believed to cause Z. A new report, noting that Y [#permalink]

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05 Aug 2008, 01:32
we need to prove the situation where X occurs but not Y, followed by Z. Hence A will be correct choice
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Re: Y has been believed to cause Z. A new report, noting that Y [#permalink]

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05 Aug 2008, 08:03
IMO A
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Re: Y has been believed to cause Z. A new report, noting that Y [#permalink]

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22 Jun 2016, 12:00
The question's OA is indeed A

Added to the 1st post.

Den
Re: Y has been believed to cause Z. A new report, noting that Y   [#permalink] 22 Jun 2016, 12:00
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# Y has been believed to cause Z. A new report, noting that Y

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