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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?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
P：研究中随机在账单上写THANKYOU会得到更多小费
C：经常在账单上写THANKYOU会得到平均更多的小费
这个推论明显是一个类比的过程，把研究中随机行为类比到现实中的经常行为，所以推论成立的必要假设就是“随机”=“经常”。
B选项：经常在账单上看见THANKYOU不会使顾客回到原来的小费习惯（也就是没有看到THANKYOU的习惯），简单的说就是“经常”不等于“没有”，从而满足了“经常”=“随机”的类比
709785tw
错选了A 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. A说的是感谢条对常客和新客效果一样。 这里的常客和新客是对饭店而言的，并没有说明对于是否经常看到感谢条的影响。 B选项 Regularly seeing “Thank you” written on their bills would not lead restaurant patrons to revert to their earlier tipping habits. 直中要害，经常看到感谢条不会让顾客改变以往给小费的习惯
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2022-09-12 13:35:19
Xxixi
E选项的重点应该在virtually all上面吧，取反的话，就是some 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. 因为conclusion说的是average, 所有即使是some patrons left a larger tip, average income也同样可以增高，就跟A选项一样，即使impact on occasional patrons没有on regular patrons那么大，average income还是会增高啊，所以取反后并不会weaken assumption
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2020-07-19 13:25:45
发呆的夜之亡魂
ACD很好排除因为根本没关系，E比较恶心的就是好像在说留下小费的大小，但是关键是并不是写与不写的差异，而是都写了，注意到这点我当时就排除E最后选B了，说实话B当时1分多钟总共的做题时间并没有看懂，现在才慢慢看懂，B说的就是习惯了，写多了就觉得thank you是人之常情而不是带有感恩了，也就不会多给了，然后B否定了这个情况，排除了一个可能导致写thank you不给更多小费的情况
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2018-07-12 16:34:01
嘉仓佑措回复发呆的夜之亡魂
我觉得E有削弱的嫌疑，因为它指出了调查中的偶然性，那么放眼全面实行，就未定了。
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2019-03-08 21:35:05
1111
随机进行的实验证明看到顾客“Thank you”给的多。 但是如果要通过regularly wrote 提高average income ，需要regularly wrote 顾客不再回到之前的习惯。 A选项还有个漏洞就是，就算regular patrons 不被影响， occasional patrons 被影响依旧可以提高 average income 。
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2017-12-10 20:26:13
TQTzzZZ
这个题的原文有明显的gap。 study里是randomly写谢谢导致了tips 3%higher的。而conclusion里说的是regularly写谢谢能带来tips的income上升。 一个是randomly，一个是regularly。就是这个题的gap，所以选项肯定会涉及这个gap。所以b的regularly怎么怎么样才是正确答案。
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2017-11-18 16:38:14
nzline
我觉得区分AB选项的主要方法就是取非。首先A取非就是，偶尔经过的路人不会有和酒店里的常客一样的反应，这对于waiter工资提高的影响很难说，因为酒店里的常客仍是未知的条件。B取非就是，经常看到便条的客人会把打赏的习惯重新变回原来，这对于waiter工资提高是能明确看出来会有影响的。因此选B。
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2017-10-10 20:56:48
wuboyang
我怎么觉得A也对呢 有时候看到谢谢这两个字会让顾客觉得惊喜，因此便会多给小费。但是如果每次看到，可能也就没什么新鲜感了，可能就不给了。
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2017-07-30 11:52:03
157006esrng回复 wuboyang
生理脑补
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2019-11-23 10:21:40
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