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A researcher studies one group of children when they are 3, 6, and 9 years old and another group of children when they are 9, 12, and 15 years old. in the context of developmental research designs, the researcher has used the _____ method. control series sequential multiple baseline panel study

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SeoJoon15

The researcher is likely using the sequential method in doing the study. This is a design in a research method in which the researchers are likely to combine the design of cross-sectional and longitudinal in a way of aiming to correct problems that lies in both designs.