Acomparison of the scores of african-american test takers to the scores of european-american test takers on current popular intelligence tests such as the wechsler adult intelligence scale and the stanford-binet indicates thata) black students outperform white students on creative and practical intelligence scoresb) the difference between the means of scores between groups is larger than the range of scores within groupsc) adopted black children score higher than their biological siblingsd) there is no difference between the scores of whites and blackse) the mean of black students is lower than the mean of white students