To discover whether residents of a city are in favor of building a new sports stadium, the team's owner randomly selected and interviewed 500 of the city's 500,000 residents. In this instance, the 500 people that the owner interviewed would be

According to the introduction to the section on problem understanding,

a. understanding occurs when we have evolved an external representation for an internal problem. b. a primary criterion for understanding is the ability to represent the problem in matrix form. c. attention is necessary for problem solution, but it is not essential for problem understanding. d. understanding requires a close correspondence between the situation you need to understand and your own internal representation.

A child has two favorite glasses: a tall, skinny one with a picture of a giraffe on it and a short, fat one with a picture of a hippopotamus on it. When her mother pours her some milk using the "hippo" glass,

the girls asks that the milk be moved into the "giraffe" glass because she is really thirsty. If the girl believes that simply transferring the milk into the taller glass increases the amount, she probably a. is in the stage of formal operations. b. has not yet reached the concrete operational stage. c. is incapable of accommodation. d. is capable of mental operations.