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

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Manager
Joined: 23 Mar 2008
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Y has been believed to cause Z. A new report, noting that Y [#permalink]

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09 Aug 2008, 10:17
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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 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.

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Director
Joined: 10 Sep 2007
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09 Aug 2008, 10:50
a) In cases where X occurs but Y does not, X is usually followed by Z.
Implies X->Z.

b) In cases where X occurs, followed by Y, Y is usually followed by Z.
Implies X->Y->Z.

c) In cases where Y occurs but X does not , Y is usually followed by Z.
Implies Y->Z.

d) In cases where occurs but Z does not, Y is usually preceded by X.
X->Y.

e) In cases where Z occurs, it is usually preceded by X and Y.
X or Y -> Z

Only A stand out, which says Z occurs because of A and not because of Y.

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SVP
Joined: 29 Aug 2007
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09 Aug 2008, 13:01
puma 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 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. If x is followed by z and y doesnot occures, then it is x that caused to be occereed z.
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VP
Joined: 17 Jun 2008
Posts: 1374

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09 Aug 2008, 18:42
puma 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. -> opposes
c) In cases where Y occurs but X does not , Y is usually followed by Z. -> opposes
d) In cases where occurs but Z does not, Y is usually preceded by X. -> what if y is preceded by x when z occurs
e) In cases where Z occurs, it is usually preceded by X and Y.-> y's absense is not said

we need to prove when y is absent z should occur if x occurs
hence clearly A does this
IMO A
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cheers
Its Now Or Never

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Manager
Joined: 23 Mar 2008
Posts: 216

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10 Aug 2008, 08:06
OA is A

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Re: CR: XYZ   [#permalink] 10 Aug 2008, 08:06
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# Y has been believed to cause Z. A new report, noting that Y

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