Explain Single Subject AB design and ABAB design; and discuss advantages and disadvantages for each design.

1. Explain Single Subject AB design and ABAB design; and discuss advantages and disadvantages for each design (1 points)
2. Contrast Classic experimental group design and Solomon group design: Identify characteristics for each design; and Explain differences between two designs (1 point).
3. Explain “Quasi-Experimental Design” and discuss how quasi-experimental design is different from classic experimental design (1 point).
4. In group experimental designs, adding a control group can control threats to the internal validity. Explain how adding a control group reduce each of the following threats to the internal validity: History effect, Selection bias. (2 points).

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