According the familial studies variation, in middle-class children's IQ scores can be primarily attributed to:

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Familial studies have shown that genetics play a significant role in the variation of IQ scores among middle-class children. This is because, in middle-class families, environmental factors such as educational opportunities and resources tend to be more uniform, allowing the genetic differences to be more prominent in influencing IQ scores.

According the Familial Studies Variation, in Middle-Class Children's IQ Scores