Question: IQ and siblings Th e correlation between a childs score on the vocabulary portion of the Wechsler Intelligence Scale for Children (a standard IQ test)

IQ and siblings Th e correlation between a child’s score on the vocabulary portion of the Wechsler Intelligence Scale for Children (a standard IQ test) and the number of siblings a child has is r 0.319.9

(a) Explain in words what this r says.

(b) Can you suggest an explanation for this relationship?

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