Meredith Phillips (1998), who studied the families of African American and white children, has proposed that environmental factors may account for __________ of the mean IQ score differences between these two ethnic groups.

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Meredith Phillips proposed that environmental factors may account for two-thirds of the mean IQ score differences between African American and white children, highlighting the significant impact of environmental influences on IQ disparities across ethnic groups.

Meredith Phillips (1998), Who Studied the Families of African American