Against All Odds - Video #8
Describing Relationships
Key Concepts:
scatterplot explanatory and response variable least-squares regression line residuals
1. In what ways are manatees threatened by humans?
2. In the manatee discussion, what is the explanatory variable and what is the response variable?
3. What are some principles and warnings about interpreting a scatterplot?
a.
b.
c.
4. How would you describe the relationship between fluoride level and cavities?
5. What categorical variable adds additional understanding of this relationship?
6. What was the flaw of the 1970 draft lottery?
7. How was the lottery conducted in 1971?
8. What is a residual?
9. In what sense is the “best-fitting line,” best fitting? What is this line called?
10. What percent of diets don't work?
11. What adaptation do our bodies make when calorie intake is reduced?
12. How was the regression line used in the dieting study?
13. What was the conclusion of this study?
14. Regression lines are only useful for what kind of relationship (per the salary example)?
15. What plot should you check for before using a regression line?