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

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Manager
Joined: 02 Jun 2011
Posts: 107
Y has been believed to cause Z. A new report, noting that Y [#permalink]

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07 Sep 2012, 13:10
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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.
Manager
Joined: 23 Aug 2011
Posts: 81
Re: Y has been believed to cause Z. A new report, noting [#permalink]

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07 Sep 2012, 14:38
A it is.

1)Y has been believed to cause Z (Y -> Z)
2)A new report, noting that Y and Z are often observed to be preceded by X; ( X -> [Z,Y])
3.)Conclusion :suggests that X, not Y, may be the cause of Z. (X -> Z)
To support new suggestion, Z must be preceded by X.

(A) In cases where X occurs but Y does not, X is usually followed by Z. ( X-> Z); this is true since Y=null
(B) In cases where X occurs, followed by Y, Y is usually followed by Z. (X->Y->Z this violates point 3.
(C) In cases where Y occurs but X does not, Y is usually followed by Z. (Y->Z) this does not strenthen conclusion coz x is missing.
(D) In cases where Y occurs but Z does not, Y is usually preceded by X.(z is missing)
(E) In cases where Z occurs, it is usually preceded by X and Y. (X,Y -> Z) it is reversed and is incorrect.
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Manager
Joined: 02 Jun 2011
Posts: 107
Re: Y has been believed to cause Z. A new report, noting [#permalink]

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08 Sep 2012, 04:20
conty911 wrote:
A it is.

1)Y has been believed to cause Z (Y -> Z)
2)A new report, noting that Y and Z are often observed to be preceded by X; ( X -> [Z,Y])
3.)Conclusion :suggests that X, not Y, may be the cause of Z. (X -> Z)
To support new suggestion, Z must be preceded by X.

(A) In cases where X occurs but Y does not, X is usually followed by Z. ( X-> Z); this is true since Y=null
(B) In cases where X occurs, followed by Y, Y is usually followed by Z. (X->Y->Z this violates point 3.
(C) In cases where Y occurs but X does not, Y is usually followed by Z. (Y->Z) this does not strenthen conclusion coz x is missing.
(D) In cases where Y occurs but Z does not, Y is usually preceded by X.(z is missing)
(E) In cases where Z occurs, it is usually preceded by X and Y. (X,Y -> Z) it is reversed and is incorrect.

Thanks dear, I have read the question incompletely and based on that I have made my decision. But you explaination work for me.
Re: Y has been believed to cause Z. A new report, noting   [#permalink] 08 Sep 2012, 04:20
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