A classic study by Bandura, Blanchard, and Ritter (1969) compared ways to treat phobias. Participants with an intense fear of snakes received one of four treatments. Some worked with a model who handled a 4-foot snake and encouraged others to imitate her. Others watched a film of adults and children who enjoyed progressively closer contact with a king snake. A third group received desensitization therapy, and a fourth group served as a control, receiving no treatment. The numbers of snake-approach responses after treatment are listed in the table. Name the independent variable and its levels. Name the dependent variable. Compute SS tot, SS treat, and SS error. Model 29,27,27,21 Film 22,18,17,15 Desensitization 21,17,16,14 Control 13,12,9,6