Maura worked at home. Her daughter, Cheri, was almost always nearby, even when Maura sat at her desk working. Maura was always talking with Cheri, and vice versa. By interacting with Cheri in this manner, Maura is promoting Cheri’s oral language and emergent literacy

Evidence supports the notion that observation of media violence

A) does not lead to subsequent aggression later in life. B) is related to higher levels of depression by age 30. C) is related to higher levels of anxiety by age 30. D) can lead to a greater readiness to act aggressively, bullying, and an insensitivity to the suffering of victims of violence.

An industrial designer wants to determine if the new design for a piece of office equipment will result in fewer errors. The designer sets up a machine with the old design in one room and a machine with the new design in a second room. He counts how many errors are made using each of the two machines. In this study, the number of errors that are made would be

a. a control variable. b. the dependent variable. c. the independent variable. d. an extraneous variable.