In a graph of single-subject research data,a clear indication of a treatment effect is

Question

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A clear and immediate change in either the level or trend when the treatment is initiated is the best indication of a treatment effect in a graph of single-subject research data. This sudden change indicates that the treatment had an impact on the behavior being measured. Continuation of the same average level or trend from one phase to the next or a gradual change in behavior may not necessarily be indicative of a treatment effect.

In a Graph of Single-Subject Research Data,a Clear Indication of a Treatment