A learned association vetween behaviors and resulting events is central to

A researcher is interested in testing the proposition that watching a lot of television causes increased

aggressiveness among children at school. This can be tested by conducting an experiment in which the independent variable is A) watching a lot of television. B) being in school. C) aggressiveness. D) age.

The drop in self-esteem often found when children first enter middle school appears to be due to a. the acquisition of concrete operational thinking. b. peer comparisons

c. changes in ethnic identity. d. the illusion of invulnerability.