In an A-B single case design,"A" represents:

Question

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In an A-B single case design, "A" represents the level of symptoms prior to the intervention. The intervention (or "B") is then introduced, and a subsequent level of symptoms is measured to assess the effectiveness of the intervention. So, option C is the correct answer since it represents the initial level of symptoms. Option A is incorrect because it refers to the intervention itself, not the initial phase. Option B is incorrect because it refers to the level of symptoms after the intervention. Option D is incorrect as it has nothing to do with the A-B design elements.

In an A-B Single Case Design,"A" Represents