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A psychologist randomly selects a large sample of children, ranging in age from 6 to 13 years old.

A psychologist randomly selects a large sample of children, ranging in age from 6 to 13 years old. The researcher measures each child's shoe size (in centimeters); then, each child's vocabulary (number of words the child knows) is determined using a standard vocabulary test. The results (scatterplot + correlation) are represented below:

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