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17The following appeared in a letter to the editor of the Walnut Grove town newspaper.
"Walnut Grove's town council has advocated switching from EZ Disposal (which has had the contract for trash collection services in Walnut Grove for the past ten years) to ABC Waste, because EZ recently raised its monthly fee from $2,000 to $2,500 a month, whereas ABC's 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 year's town survey agreed that they were 'satisfied' with EZ's performance."
因为EZ涨价;所以委员会换成ABC
EZ一个星期捡两次垃圾,ABC一次+EZ有20辆还多,ABC只有20辆+ 调查的居民中80%表示满意 所以继续用EZ
1 oversimplification不一定是因为涨价
2 捡的次数和车的数量不说明服务质量
3 selective sample
The arguer simply attributes the shift decision of the council to the prize raise of EZ Disposal, and based on the facts of pick up times and truck numbers in the fleet as well as a survey, the arguer concludes that they should stick to EZ. However, after an overall consideration of the argument, we would find both the evidence and conclusion problematic.
First of all, the speaker oversimplifies the cause of the council’s decision to shift from EZ to ABC as a 500dollars prize raise of EZ Disposal, which is quite rootless. Although the council may take the prize into consideration, however, without any evidence showing that, it is entirely possible it is actually the service quality that helps them make up their mind. ABC might keep the streets of the town much cleaner than EZ can do, or even could provide the extra services such as lawn cut and back street tidying, which the council considered superior to EZ Disposal. Before ruling out these possibilities, I can not be convinced that the prize raise is the very reason for the shift.
Secondly, the arguer cites the car numbers in the fleet as evidence to show that EZ could do better job than ABC, which may not be the case. Without mentioning whether ABC are holding the same decision as EZ to increase the truck number, we could not assume that there are more trucks in EZ’s fleet. Even if there is, it may rightfully serve as a counterexample indicating that EZ’s work is not as efficient as ABC’s, since their service quality may be at the same level or even ABC is better. However, in the absence of the evidence that could link the truck number directly to the service quality, the evidence could lend to strong support to the conclusion that people should chose EZ.
Finally, in the survey which the conclusion also relies on, the arguer fails to inform us with the detailed information concerning the sample size and most important, the sample selection procedure. There stands a good chance that people who responded to the survey are those who are more likely to satisfied with EZ’s job while the other people simply ignored to answer. This kind of selective sample could not represent the residents there in all, and consequently invalidates the survey.
To sum up, the arguer overlooks many contingencies and lacks of the reliable evidence to bolster the conclusion. In order to make the argument more convincing, a comprehensive analysis about the actual cause of the council’s decision and the service quality should be needed, and a precise data of the survey is also required.
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