Comparative Studies of the Intelligence Scores of the Black and White

Comparative studies of the intelligence scores of the black and white populations in America indicate that __________.

A) there are no overlaps between the intelligence score distributions of these populations
B) the variability of scores within groups is greater than that between groups
C) the average of the two groups is the same, but there is more variability among white Americans
D) the average of the two groups is the same, but there is more variability among black Americans

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