[讨论]gwd17-30再讨论

Q30:

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?

1. 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.
           
2. Regularly seeing “Thank you” written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.
           
3. The written “Thank you” reminds restaurant patrons that tips constitute a significant part of the income of many food servers.
           
4. The rate at which people tip food servers in Pennsylvania does not vary with how expensive a restaurant is.
           
5. 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.

以前的讨论

Q30:

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.

推导关系为，发现偶尔地写谢谢在帐单上会刺激顾客多给小费-----每张都写，那小费会显著增加。

Which of the following is an assumption on which the argument relies?

1. 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.
2. Regularly seeing “Thank you” written on their bills would not lead restaurant patrons to revert to their earlier tipping habits. 取非，
                       经常看到谢谢，人们将会到以前给小费的习惯，即不详一开始看到谢谢时那样多给小费了
   
                   
3. The written “Thank you” reminds restaurant patrons that tips constitute a significant part of the income of many food servers.无关
                   
4. The rate at which people tip food servers in Pennsylvania does not vary with how expensive a restaurant is. 无关，只是消费有没有增量， 而无关增加多少
                   
5. 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. 增强原推导关系的依据， 而且这个选项中有绝对词all，试想， 一个人赖以推导的假设不太可能是很绝对的说法，发现绝对词排除法在逻辑和阅读中都有限有效。

如果说选b 的理由是 从randomly变成regularly人们就会改变各消费的习惯

那么这样完全可以退出reguarly 无法达到randomly 的效果

所以，这样不就是和a表达的同一个意思吗？ 

请nn们赐教！！！thank you

请 大家看看这道题 帮我讲讲

谢谢

B直接取非结论不成立。。

a取非的话 那么不就和b一样的吗？

我觉得a b 的意思是一样的

up

Just simplify the logic of the passage and identify certain key words;
Logic Structure

Premise:             on randomly selected bills (mean Some) "Thank you" ==>higher Tips;
Conclusion:         Reguar (means Most or All) "Thank you" ==> higher tips
Assumption:      Situation for Some "Thank you" = Situation of Most or All "Thank you" 
For this question, it can be materialized as the following, All factors which favor tipping remain same.  Answer B is one of examples.

但是这个分析正说明应该将客户群体扩大，所以感觉A更合适呀

必须有个assumption是经常看到thank you massage的人不会变更原先的习惯

才能得出结论: 顾客看到thank you massage, 造成restaurant收入增加

A选拿老主顾与偶而光顾的客人比较->无意义

请指教

好!(鼓掌.......)

太有才了!!!