A random sample of 175 people who had lunch at a company cafeteria were offered a brownie. Some were handed the brownie on a fine piece of china, others were given the brownie on a paper plate, and others were given the brownie on a paper napkin.

Each person was asked how much they would be willing to pay. Is there sufficient evidence to conclude that the prices differed according to the way the brownies were offered?

The following exercises use data files associated with three exercises seen previously in this book.