21. A health psychologist tests a new intervention to determine if it can change healthy behav- iors among children. To conduct the test, the researcher gives one group of children an intervention, and a second group is given a control task without the intervention. The number of healthy behaviors observed in the children during a 5-minute observation are given in the table. Intervention Yes 7 47 No 5 6 5 6 7 5 7 6 5 (a) Test whether or not the number of healthy behaviors differ at a .05 level of signifi- cance. State the value of the test statis- tic and the decision to retain or reject the null hypothesis. (b) Compute effect size using eta-squared. 2. A clinical psychologic iblings