A school social worker wants to evaluate a new anti-bullying intervention for a single student. The social worker collects baseline data on the student's aggressive behaviors for two weeks (Phase A), implements the intervention for four weeks (Phase B), and then briefly withdraws the intervention to see if aggressive behaviors return (Phase A). Which research design is the social worker using?
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A
A quasi-experimental design
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B
An ABA single-subject design
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C
A longitudinal cohort study
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D
A cross-sectional survey