In trying to understand the impacts of caffeine on consumer spending, researchers in France ran the following experiment: 145 people walking into a home goods store were offered a welcome beverage: an espresso (caffeinated) or an

option of a non-caffeinated drink. 58 shoppers chose the espresso while 87 went for the non -caffeinated alternative. On average the caffeinated shoppers spent $18 with a standard deviation of $29, while the non- caffeinated folks

spent on average $9 with a standard deviation of $16.

Which statement is correct?

a. It is not unusual for a caffeinated shopper to spend above $50

b. It is harder to predict what non-caffeinated shoppers will do.

c. All caffeinated shoppers spend more than non-caffeinated ones