Girls begin their growth spurt around age ____, while boys begin their growth spurt around age

Because Dr. Frederickson's students are aware of the purposes of a study, they may see and record what they expect to see rather than what the participants actually do. This is known as

A) event influence. B) observer bias. C) a cohort effect. D) internal validity.

__________ was the psychologist who suggested that behavior modification could be used to create a utopian society in which no one is aggressive or violent

a. Jean Piaget b. B.F. Skinner c. Carl Rogers d. Abraham Maslow