Read Article 1 and answer following questions:

1. What is the explicitly stated purpose of this meta-analysis? 2. Why were international studies were not included? 3. Of the 749 studies that were identified, how many were excluded? 4. How many quality rating points were awarded to a study for being a randomized experiment? 5. Of the 23 studies included in the analysis, how many had participants that were predominantly African-American? 6. What was overall effect size for the 23 studies?