Kyle: The rate of highway fatalities per 100 million miles driven was about a third lower last year than ten years ago. The decrease is mainly attributable to greater use of seat belts and to less drinking of alcohol by drivers, but last year s sluggish economy also contributed, by curtai- ling driving.
Lisa: The economy could not have been a factor, because even if fewer fatalities occur when fewer miles are driven, the number "per 100 million miles driven" is what you were discussing, and that figure would not fall merely because fewer miles were driven. Lisa s objection is based on A) indicating, that a confusion between cause and effect has taken place B) distinguishing between total number of instances and rate of occurrence C) proposing an alternative way of interpreting the data presented D) pointing out that statistics can be misleading if selected to prove a point E) showing that lack of precision has caused a relevant ambiguity 答案是B
Lisa指出了kyle的一个问题就是，kyle讨论的是 "per 100 million miles driven" 那么也就是说不管是开的mile多了还是少了，比较都是以100mile为基础。比方说去年开了100mile，死了2个人，那么是2/100，今年开的mile少了只有50mile，死了1个人，那么是1/50，尽管mile少了这两个rate是一样的,这就是lisa的论点所在。
Lisa指出了kyle的一个问题就是，kyle讨论的是 "per 100 million miles driven" 那么也就是说不管是开的mile多了还是少了，比较都是以100mile为基础。比方说去年开了100mile，死了2个人，那么是2/100，今年开的mile少了只有50mile，死了1个人，那么是1/50，尽管mile少了这两个rate是一样的,这就是lisa的论点所在。
-- by 会员 camelo777 (2011/6/20 5:32:16)
LZ是没读明白答案的意思,我帮忙解释下 distinguishing between total number of instances and rate of occurrence
total number of instances就是上面camelo说的死了2个人，和死了1个人。死的总人数 rate of occurrence是2/100和1/50。死的比率
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发表于 2011-6-20 05:12:54
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