A psychologist studies 21 children on their first day of school, and examines the same children again on the last day. This is a __________ research design.

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A longitudinal research design involves observing and measuring the same group of individuals over an extended period of time to study developmental changes or stability. In this case, the psychologist is studying the same group of children on their first day of school and their last day, making it a longitudinal design. Double-blind and cross-sectional designs involve different methods of data collection and analysis, and cross-sequential research designs involve a combination of both longitudinal and cross-sectional designs.

A Psychologist Studies 21 Children on Their First Day of School