C、文中的调查是否具有说服力值得商榷,作者并没有交待该调查的样本基数以及样本是否随机化。如果样本基数不够或者样本选择缺乏随机性,则该调查不具有说服力。另外,该调查只在Capital City进行,并不能够代表I地区。即使该调查具有说服力,I地区平均人均花费$50在赌博上,I地区的居民也未必会将这些钱用于购买彩票。赌博和彩票属于两个不同的概念。
17.The following appeared in a letter to the editor of the Walnut Grove town newspaper.
Walnut Groves town council has advocated switching from EZ Disposal to ABC Waste, because EZ recently raised its monthly fee from $2,000 to $2,500 a month, whereas ABCs fee is still $2,000. But the town council is mistaken; we should continue using EZ. EZ collects trash twice a week, while ABC collects only once. Moreover, EZ-which, like ABC, currently has a fleet of 20 trucks-has ordered additional trucks. Finally, EZ provides exceptional service: 80 percent of respondents to last years town survey agreed that they were satisfied with EZs performance.
A、ABC每周收集一次垃圾,EZ每周收集两次,这并不表明ABC就要比EZ差。ABC虽然频数小,可是他们收集的效果可能要好,例如收集得更干净,服务态度更好;而EZ虽然每周收集两次,但是他们可能收集地不太干净。另外,一周收集两次是否对于WG镇是需要的,这点作者也没有说清楚。
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