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A researcher wants to evaluate a new note-taking intervention using three participants. She records each participant's exam scores during a baseline phase and then begins the intervention with all three participants during the same week. Because she measured baselines for multiple individuals, this design effectively rules out the possibility that an outside event—rather than the intervention—caused any observed improvement in exam scores.
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Research Methods in Psychology - 4th American Edition @ KPU
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Multiple-Baseline Design Across Participants Example
In a multiple-baseline design across participants, what is the crucial procedural feature that helps establish internal validity?
A researcher wants to evaluate a new note-taking intervention using three participants. She records each participant's exam scores during a baseline phase and then begins the intervention with all three participants during the same week. Because she measured baselines for multiple individuals, this design effectively rules out the possibility that an outside event—rather than the intervention—caused any observed improvement in exam scores.