In a single-case experiment to treat a young girl's selective mutism (refusal to speak),treatment was applied at a restaurant,an office building,and when playing with peers.This represents

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The scenario describes a multiple-baseline design across situations. The treatment is applied in various settings (restaurant, office, playing with peers), and it aims to evaluate if the treatment is effective across different situations. A multiple-baseline design is appropriate for this scenario because it permits the evaluation of the effect of the intervention across multiple behaviors or settings.

In a Single-Case Experiment to Treat a Young Girl's Selective