A social psychologist interested in the effects of media violence arranged to have 15 children watch a popular children’s TV show that included a lot of violence. Five were randomly assigned to watch the show on a small-screen TV, five on a standard size screen TV, and five a large screen TV. Immediately after, each child was left in a room with various toys and the number of seconds of play with violent toys was systematically recorded. What's the dependant variable and independent variable?