Albert Bandura has conducted a number of studies on aggression in children.In one study (Bandura, Ross, & Ross, 1963), one group of nursery school children were shown a film of adults punching, hitting (with a hammer), kicking, and throwing a large rubber Bobo doll. Another group was not shown the film. Afterward, both groups were allowed to play with Bobo dolls in a playroom, and the number of violent contacts were measured in each child. Let us imagine that we replicated this study and obtained the following data (scores are the number of violent contacts with the Bobo doll):

(a) State formally the hypotheses necessary to conduct a directional test of no difference between the two population means.

(b) Complete the test at the .01 level of significance, and state your conclusion.

(c) Compute the estimated effect size, g, and r.