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1. a.
This design is a type of Solomon four-group design. In this design, schools are randomly assigned to four different groups and all groups are given the posttest. Two of the groups are given pretests. One of the pretest groups is assigned to treatment and one of the non-pretest groups is assigned to treatment.
This design is a robust and sophisticated research design. It controls for factors associated with both internal and external validity. This design allows researchers to determine the effects of a treatment in relation to a control group, determine any effects of a pretest on the dependent variable, and explain any interactions between the pretest and the treatment. It explicitly examines the potential sensitizing effect of the pretest as it might interact with the treatment. The design helps the resultof the study validate its generalizability and enhance the external validity....

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