1. Epidemiologist find a higher rate of oral cancer among drinkers than non-drinkers. If alcohol causes oral cancer, would that tend to create an association between drinking and oral cancer? explain briefly.2.An instructor standardized her midterm and final each semester so the class average is 50 and the SD is 10 on both tests. The correlation between the tests is around 0.5. One semester, she took all the students who scored around 30 at the midterm, and gave them special tutoring. On average, they gained 10 points on the final. Can this explained by the regression effect?

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