[語文] 費費邏輯no.94
94. When 100 people who have not used cocaine are tested for cocaine use, on
average only 5 will test positive. By contrast, of every 100 people who have
used cocaine 99 will test positive. Thus, when a randomly chosen group of
people is tested for cocaine use, the vast people is tested for cocaine use,
the vast majority of those who test positive will be people who have used
cocaine.
A reasoning error in the argument is that the argument
(A) attempts to infer a value judgement from purely factual premises
(B) attributes to every member of the population the properties of the
average member of the population
(C) fails to take into account what proportion of the population have used
cocaine
(D) ignores the fact that some cocaine users do not test positive
(E) advocates testing people for cocaine use when there is no reason to
suspect that they have used cocaine
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我知道GMAT很喜歡考百分比跟實際value之間的關係還有類比
但是這一題的綠色部分我就是看不大懂(汗)
此外，這樣的話的答案應該是(A)對嗎?
希望有版友能夠幫我給我一些意見
謝謝!!!
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