Single-system design 1) Suppose you use an ABAB design to evaluate the effectiveness of a group intervention aimed at helping a particular child improve her social skills. Your outcome indicator is the number of friends she plays with after school each day, and you obtain the following results:A1: 0 0 0 0 0 B1: 1 1 2 2 2 A2: 2 2 2 2 2B2: 2 2 2 2 2 What might you conclude from these data? Was the intervention effective? Can history be ruled out? 2) Suppose you conducted a multiple baseline study to evaluate the intervention above. In this study you introduce three girls from the same school to the group at different points and you obtain the following results regarding the number of friend each plays with after school each day: Baseline Intervention Girl 1: 0 0 0 1 1 1 2 2 2 2 Girl 2: 0 0 0 1 1 1 2 2 2 2 Girl 3: 0 0 0 1 1 1 1 2 2 2 What might you conclude from these data? Was the intervention effective? Can history be ruled out? 3) Suppose you use the same intervention as above, but before starting the group intervention you tried a social skills intervention with the client in an individual context. Suppose your ABC design yielded the following results regarding the number of friends she plays with after school each day:A: 0 0 0 0 0 0 B: 0 0 0 0 0 0 C: 1 1 1 2 2 2What might you conclude from these data? Is it plausible that the group intervention is effective with this client?