Ray Friedman and His Colleagues Administered a 20-Item Test to African-American

Ray Friedman and his colleagues administered a 20-item test to African-American and European-American students before and during the presidential election of Barack Obama.Before the election,the African-American students performed more poorly than the European-American students.During the election period,the African-American students

A) showed no change from their earlier performance.
B) showed a further decrese in their scores.
C) performed just as well as the European-American students.
D) significantly outperformed the European-American students.

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