Research in which the same group is tested and retested over a period of years is a

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A longitudinal study involves testing the same group of individuals over a prolonged period of time. This contrasts with a cross-sectional study, which involves examining different groups of people at one point in time, and a scatterplot and regression toward the mean, which are statistical methods and not types of research designs.

Research in Which the Same Group Is Tested and Retested