以下是引用goyce36在2008-8-17 18:15:00的发言:想问:A的两个时间点是不是写反了?? Participants who were depressed at the study’s start were no more likely to be smokers at the study’s end 我觉得应该倒过来才对。 我同意楼上,不然就没有选项了。 原文的推理是 因为在一个为期一年的调查中,头一个月就学会抽烟的青少年比一直不会抽烟的在调查结束时,出现精神问题问题的可能性大四倍。所以抽烟会导致精神问题。 A. Participants who were depressed at the study's start were no more likely to be smokers at the study's end than those who were not depressed. 在实验开始就有精神问题的青少年不比开始就没有精神问题的更容易在实验结束时学会抽烟。 题目讨论的不是谁更容易学会抽烟!而且根本就没有讨论实验结束时抽烟的状况。 即使把A取反,“在实验开始就有精神问题的青少年比开始就没有精神问题人在实验结束时更容易学会抽烟”,原文推理仍然成立。 如果A换成 Participants who were depressed at the study's END were no more likely to be smokers at the study's START than those who were not depressed. 取反,才是因果颠倒的问题。
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