Dr. Martinez is studying the development of math skills in children. She has assessed three separate groups of children (Age 6, Age 8, and Age 10) in the past month and is comparing their behavior to determine age effects. The research design she is using is

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The research design Dr. Martinez is using is cross-sectional because she is assessing three separate groups of children of different ages at one specific point in time. She is not following the same group of children over a period of time (longitudinal) or comparing different cohorts of children over a period of time (cohort). She is also not using a sequential design, which involves a combination of cross-sectional and longitudinal designs. Additionally, the study does not appear to be focused on examining the relationship between variables (correlational).

Dr Martinez Is Studying the Development of Math Skills in Children