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

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

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New post 18 Jan 2009, 12:51
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A
B
C
D
E

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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.

A

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Manager
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Re: CR: XYZ Logic [#permalink]

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New post 18 Jan 2009, 12:57
Need to prove that X=>Z and not Y.
Only A meets the criteria.

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Manager
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Re: CR: XYZ Logic [#permalink]

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New post 18 Jan 2009, 14:36
(B)
_________________

Kick GMAT ass

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Director
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Joined: 12 Oct 2008
Posts: 539

Kudos [?]: 592 [0], given: 2

Re: CR: XYZ Logic [#permalink]

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New post 18 Jan 2009, 22:50
OA A

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Intern
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Re: CR: XYZ Logic [#permalink]

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New post 18 Jan 2009, 23:00
Conclusion: X not Y may be the cause of Z.
The statement which supports the conclusion should surely involve X & Z. So, I cross out C and D.
B & E don’t support the conclusion. I will go with A.

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Director
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Re: CR: XYZ Logic [#permalink]

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New post 19 Jan 2009, 11:27
A...

Kudos [?]: 844 [0], given: 99

Re: CR: XYZ Logic   [#permalink] 19 Jan 2009, 11:27
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Y has been believed to cause Z. A new report, noting that Y

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