A researcher records health assessment scores for two children. The first child takes the assessment at baseline for two trials, and the second child takes the assessment for four trials at baseline. After baseline, both children received a treatment (a health lesson) and then each child is again scored on the assessment for four trials. It is expected that scores on the health assessment will improve only after the treatment is administered. What type of single-case design is described in this example?
A. multiple-baseline design
B. reversal design
C. changing-criterion design
D. posttest-only design
Answer: A
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