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Lecture 17

FRHD 3070 Lecture 17: Lecture 17

2 Pages

Family Relations and Human Development
Course Code
FRHD 3070

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QUASI-EXPERIMENTAL DESIGNS One-group posttest only design Compare the responses of a number of individuals exposed to the same event One-Group Pretest-Posttest Design Add a baseline measure to provide a basisfor comparison Threats to internal validity History effects Maturation effects Testing effects Instrument decay Regression toward the mean Threats to internal validity Can be overcome by introducing a control group into the experiment An equivalent control group is preferable but not always possible in quasi-experimental designs Nonequivalent Control Group Design group introduced not equivalent due to lack of random assignment Selection differences Nonequivalent Control Group Pretest-Posttest Design An improvement on the non-equivalent control group design Addition of pre-test improves internal validity Can assess for differences prior to Testing Interrupted Time Series Design Examines the dependent variable over an extended period of time, both before and after the IV is implemented Control Series Design Improves interrupted time series design by finding an appropriate control group Involves finding a similar population that did not receive a particular manipulation DEVELOPMENTAL RESEAR
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