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Strength of correlation (R squared): 0.307 (this correlation is weak)
Percent of respondents who said they smoke 'some days'.
The percentage of students that achieved a scale score in the subject of Reading at or above the level of Advanced.
Advanced implies superior performance.
Source:
Centers for Disease Control and Prevention (CDC). Behavioral Risk Factor Surveillance System Survey Data. Atlanta, Georgia: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, 2004.