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Ina study conducted in Pennsylvania, servers in various restaurants wrote “Thankyou” on randomly selected bills before presenting the bills to theircustomers. Tips on these bills were anaverage of three percentage points higher than tips on bills without themessage. Therefore, if servers inPennsylvania regularly wrote “Thank you” on restaurant bills, their averageincome from tips would be significantly higher than it otherwise would havebeen. Whichof the following is an assumption on which the argument relies? A.The “Thank you” messages would have the same impact on regular patrons of arestaurant as they would on occasional patrons of the same restaurant. B.Regularly seeing “Thank you” written on their bills would not lead restaurantpatrons to revert to their earlier tipping habits. C.The written “Thank you” reminds restaurant patrons that tips constitute asignificant part of the income of many food servers. D.The rate at which people tip food servers in Pennsylvania does not vary withhow expensive a restaurant is. E.Virtually all patrons of the Pennsylvania restaurants in the study who weregiven a bill with “Thank you” written on it left a larger tip than they otherwisewould have.
这道题被归类为统计枚举模式。我的想法是应该是方案推理。正确答案B也是CQ3 法案副作用。向大家讨教。
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发表于 2014-4-7 17:21:26
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