Ina study conductedinCanada, serversinvariousrestaurantswrote“Thank you" onrandomlyselected bills beforepresentingthebillstotheircustomers.Tipsonthesebillswerean averageofthreepercentagepointshigherthantipsonbillswithoutthemessage. Therefore,if serversinCanada regularlywrote“Thank you”onrestauranttheiraverageincomefromtipswouldbesignificantlyhigherthanitotherwisewouldhavebeen.
Whichofthefollowingisanassumptiononwhichtheargumentrelies?
A. The“Thank you"messages wouldhavethesame impacton regularpatronsofa restaurantastheywouldonoccasionalpatronsofthesamerestaurant.
B. Regularlyseeing“Thank you" writtenontheir billswouldnotleadrestaurant patronstoreverttotheir earliertippinghabits.
C. Thewritten “Thank you" remindsrestaurantpatronsthattipsconstitute a significantpartoftheincomeofmanyfoodservers.
D. Therateat whichpeopletipfoodserversinCanadadoesnotvarywithhowexpensivearestaurantis.
E. Virtuallyall patronsofthe Canadianrestaurantsinthe study who weregivena billwith“Thank you” written onitleftalarger tipthantheyotherwisewouldhave.
Whichofthefollowingisanassumptiononwhichtheargumentrelies?
A. The“Thank you"messages wouldhavethesame impacton regularpatronsofa restaurantastheywouldonoccasionalpatronsofthesamerestaurant.
B. Regularlyseeing“Thank you" writtenontheir billswouldnotleadrestaurant patronstoreverttotheir earliertippinghabits.
C. Thewritten “Thank you" remindsrestaurantpatronsthattipsconstitute a significantpartoftheincomeofmanyfoodservers.
D. Therateat whichpeopletipfoodserversinCanadadoesnotvarywithhowexpensivearestaurantis.
E. Virtuallyall patronsofthe Canadianrestaurantsinthe study who weregivena billwith“Thank you” written onitleftalarger tipthantheyotherwisewouldhave.
