Many students struggle with statistical concepts such as interaction. In an experimental group, participants took a paper-and-pencil test and then were given training to establish equivalent classes containing four different statistical interactions. All participants formed the equivalence classes and showed maintenance when probes contained novel…

Shows that guilt, rather than sympathy or a desire to make restitution, is the dominant factor in bringing about compliance to a request. Bibliography and tables. (JB)

Sees motives of cooperation and noncooperation as a function of the game's reward system and infers that the same motives may operate in real-life situations. Bibliography, tables, and graphs. (RW)