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# After observing the Earth s weather patterns and the 11-year

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Senior Manager
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After observing the Earth s weather patterns and the 11-year [#permalink]

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19 Jan 2007, 02:31
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After observing the Earthâ€™s weather patterns and the 11-year sunspot cycle of the Sun for 36 years, scientists have found that high levels of sunspot activity precede shifts in wind patterns that affect the Earthâ€™s weather. One can conclude that meteorologists will be able to improve their weather forecasts based on this information.
Which of the following, if true, most seriously weakens the argument above?
(A) Weather forecasts are more detailed today than they were 36 years ago.
(B) Scientists can establish that sunspot activity directly affects the Earthâ€™s weather.
(C) Evidence other than sunspot activity has previously enabled meteorologists to forecast the weather conditions that are predictable on the basis of sunspot activity.
(D) Scientists have not determined why the sunspot activity on the Sun follows an 11-year cycle.
(E) It has been established that predictable wind patterns yield predictable weather patterns.

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Manager
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19 Jan 2007, 02:50
C?

Conclusion of the argument: Can use sunspots activity as a predictor to Earth's weather.

C: Weakens the conclusion in showing that there are better alternatives to use to predict weather.

(A) Irrelevant. The research has been going on for 36 yrs, not comparing results of an experiment 36 yrs ago with today

(B) Strengthens the argument.

(D) Irrelevant. No connection between 11 yrs cycle of sunspot activity and the conclusion

(E) Potentially strengthen the argument.

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Senior Manager
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19 Jan 2007, 03:05
D...

because it's not related so it weakens the argument?

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Director
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Schools: Stanford, Chicago Booth, Babson College

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19 Jan 2007, 03:38
Evidence other than sun spot activity has helped in the past. It is possible that similar type of evidence will be helpful in the future, and not the one based on sun spot activity.

Hence, C.

C also by POE.

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Senior Manager
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19 Jan 2007, 17:31
C....based on the presence of alternate reason....

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19 Jan 2007, 22:21
C !
_________________

"Education is what remains when one has forgotten everything he learned in school."

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Senior Manager
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27 Jan 2007, 04:08
oa is C

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27 Jan 2007, 04:08
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# After observing the Earth s weather patterns and the 11-year

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