A study followed a group of teenagers who had never smoked and tracked whether they took up smoking and how their mental health changed. After one year, the incidence of depression among those who had taken up smoking was four times as high as it was among those who had not. Since nicotine in cigarettes changes brain chemistry, perhaps thereby affecting mood, it is likely that smoking contributes to depression in teenagers.
Which of the following, if true, most strengthens the argument?
A. Participants who were depressed at the start of the study were no more likely to be smokers after one year than those who were not depressed.
B. The study did not distinguish between participants who smoked only occasionally and those who were heavy smokers.
C. Few, if any, of the participants in the study were friends or relatives of other participants.
D. Some participants entered and emerged from a period of depression within the year of the study.
E. The researchers did not track use of alcohol by the teenagers.
Whenever there is a survey or statistical analysis, one needs to have confidence of the data collected.
The conclusion is that smoking is likely to contribute to depression in teenagers. The premise is that more NEW smokers are depressed than non-smokers. The argument wants to say that smoking CAUSES depression.
But what if it is the other way around? What if depressed people are more likely becoming smokers than non-depressed peopl?
Choice A removes that possibility, thus a correct answer for this strengthener question. Choice A simply vouchers for the representativeness of the data by removing the potential bias when selecting the participants.作者: instinctwu 时间: 2012-8-2 06:39
LS太牛了，分析的很清楚啊，太感谢了.
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