A government survey released today shows that 80% of the people who fly are satisfied with the service they receive from the airlines in this country....
Question
A government survey released today shows that 80% of the people who fly are satisfied with the service they receive from the airlines in this country. Three interviewers stood outside a major airport and asked people leaving the terminal, “Do you have any complaints about the flight you just got off?” Only 20 percent responded “yes!”
Which of the following, if true, would most undermine the conclusion of the argument above?