Brad is an athletic boy who is on every sports team in school. stephen loves math and is part of his school’s math club. these instances reflect correlations that occur when children seek out environments that they find compatible and stimulating.

Active (Niche-Picking) Genotype-Environment

Explanation:

According to my research on studies conducted by various sociologists, I can say that based on the information provided within the question these instances reflect Active (Niche-Picking) Genotype-Environment. This term is defined as when children and adolescents seek out certain environments they find compatible and stimulating. In this situation both Students joined activities or groups that interested and stimulated their likes.

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this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.