Single case, Quasi-experimental, and Developmental research

· Describe single-case experimental designs and discuss reasons to use this design.

· Describe the one-group posttest-only design.

· Describe the one-group pretest-posttest design and the associated threats to internal validity that may occur: history, maturation, testing, instrument decay, and regression toward the mean.

· Describe the nonequivalent control group design and nonequivalent control group pretest-posttest design, and discuss the advantages of having a control group.

· Distinguish between the interrupted time series design and control series design.

· Describe cross-sectional, longitudinal, and sequential research designs, including the advantages and disadvantages of each design.

· Define cohort effect.

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