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Creswell_Research_Design_ Qualitative Quantitative and Mixed Methods Approaches 2018 5th Ed

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Posttest-Only Control-Group Design

This design controls for any confounding effects of a pretest and is a popular experimental design. The participants are randomly assigned

to groups, a treatment is given only to the experimental group, and both groups are measured on the posttest.

Group A R——————X—————O

Group B R————————————O

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