Dr. Marquez is lecturing to his class on single-subject designs. He notes that in an A-B design, the A phase represents the:

Question

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The A phase in an A-B design represents the baseline measurement, where data is collected on the subject's behavior or performance before any intervention or experimental treatment is applied. This phase serves as a control or reference point to compare against the effects of the intervention introduced in the B phase.

Dr Marquez Is Lecturing to His Class on Single-Subject Designs