Longitudinal studies of children have shown that the correlation between viewing television violence and subsequent aggressive behavior increases along with the age of the child

The textbook reports research studies involving films of actors who worked in darkened

conditions while wearing small lights attached to several parts of their bodies. The research showed that participants who watched the films could report all of the following EXCEPT a. that actions were taking place. b. that the actions taking place were human. c. what the actions were. d. what the gender of the person making the actions was. e. what the age of the person making the actions was.

In a laboratory, smokers are asked to drive using a computerized driving simulator and cover the maximum distance possible, while avoiding rear-end collisions. Some volunteers are given a real cigarette to smoke immediately before the test

Others smoke a fake cigarette without nicotine. The number of collisions the two groups make is to be compared. In this study, the independent variable is: a. the use of nicotine. b. the use of a driving simulator. c. the number of collisions. d. the speed of each driver.