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题库 / Prep2008E2-CR-119
In a study conducted in Pennsylvania, servers in various restaurants wrote "Thank you" on randomly selected bills before presenting the bills to their customers. Tips on these bills were an average of three percentage points higher than tips on bills without the message. Therefore, if servers in Pennsylvania regularly wrote "Thank you" on restaurant bills, their average income from tips would be significantly higher than it otherwise would have been.
Which of the following is an assumption on which the argument relies?
The "Thank you" messages would have the same impact on regular patrons of a restaurant as they would on occasional patrons of the same restaurant.
Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.
The written "Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers.
The rate at which people tip food servers in Pennsylvania does not vary with how expensive a restaurant is.
Virtually all patrons of the Pennsylvania restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.
情景：一个在宾州的研究显示，如果随机的在顾客的账单上填写Thank You，那么在那些有Thank You的账单上获得的小费比较多。因此，如果经常性的在顾客的账单上填写Thank You，那么会比之前获得更多的小费。
选项分析：
A选项：Thank you这个信息对于经常来的老客户的效果和对于新客户的效果是相同的。
B选项：Correct. 经常性的看到Thank you不会改变客户的付小费习惯。如果经常性看到thank you“会”改变客户的付小费习惯，则本选项给出了随机填写Thank You和经常性填写Thank You的区别，可以削弱推理。
C选项： Thank you这个信息让餐厅客户意识到小费占据服务员很大的收入比例。
D选项： 餐厅客户付小费的比率（这个比率的意思应该是餐费乘以该比率=服务员的小费数）不会被餐厅本身的价格所影响。
E选项：在研究中，几乎所有被出示Thank you的人都会比从前不出示Thank you时多给一部分小费。
题干逻辑链条：用随机的thank you提高了小费率推出规则的thank you能增加小费率。
CR：忽视了随机和规则的不同点。
改变习惯指的是不会改变他看到thank you之后会多给小费的习惯而不是 不会改变他在没有看到thank you时给小费的习惯（就是thank you)不会影响给小费）
Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.
经常性的看到账单上的“Thank you”不会改变餐厅顾客之前的消费习惯；取反，如果经常看到“thank you”会改变他们的小费习惯的话，servers的收入就会增加了；反之则不会增加
Refer to Ron's explanation here: 'earlier tipping habits' = 3 percentage points lower than after seeing the handwritten notes.
类比的区别在：random和regular
C选项：迷惑！！ Thank you这个信息让餐厅客户意识到小费占据服务员很大的收入比例。本选项没有提到案例名称，可以排除。
没有说意识到很大比例就会多给钱，且和类比无关
推理：因为结论句重复了前提句：“填写Thank You会获得更多的小费”，所以推理文段为类比推理。
选题方式：类比推理一共具有两个评估方向，简而言之，即，类比推理一共具有两个评估方向，要么提到“随机”或者“经常”，要么给出与这两个案例相平行等价的案例C。
我理解题意是问写thank you就会提高服务员收入，这个论断基于什么推理。应该是加强项，但B选项既然写不写都不会改变顾客的行为，那不是就意味着服务员的收入不一定会增加吗？
可以理解成以目标方案为结论的相关因果推理的CQ1吗
我也。。。我是用的方案的否定性副作用做的= =
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B是削弱可是问题不是问加强么
解析更新了一下
毕大大~是不是不会改变习惯指的是不会改变他看到thank you之后会多给小费的习惯而不是 不会改变他在没有看到thank you时给小费的习惯（就是thank you)不会影响给小费）
是的。
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