Dr. Gonzalez who studies the development of aggression by selecting a sample of 2-year-olds and a sample of 4-year-olds and follows them for 5 years to see if they become any more or less aggressive is employing a ____.

The most important advantage of the experimental method is that it

An important limitation of all correlational studies is that they

Suppose you randomly assign one group of children to watch violent TV programs and other to watch nonviolent programs. You then measure their aggressive behavior on playground after watching these programs. The measure of aggressive behavior is your ____ in this experiment.

Jorge has been hanging with an inner city gang for nearly two years, participating in gang activities and carefully gathering notes in an attempt to learn how gangs might influence the development of inner-city youth. Jorge is relying on ____ as a research strategy.

To study the effect of the teacher's gender on children's scholastic performances, third-graders in a large school are randomly assigned to classes with female teachers or to classes with male teachers. This is a

Many investigators have found a positive correlation between the amount of prosocial television programming children watch at home and the frequency of children's prosocial (that is, kindly or helpful) behaviors at nursery school. These data clearly establish that exposure to prosocial television causes children to become more prosocially inclined.