1. Active Learning Lecture Slides
Chapter 20 Curved Patterns
Active Learning Lecture Slides
For use with Classroom Response Systems

2. A transformation is a re-expression of a variable by applying a function to each observation.
True
False

3. A transformation is a re-expression of a variable by applying a function to each observation.
True
False

4. Which of the following are possible transformations?
Reciprocal
Log
Square
All of the above

5. Which of the following are possible transformations?
Reciprocal
Log
Square
All of the above

6. The process of choosing an appropriate transformation is usually iterative: Try a transformation to see whether it makes the association more linear.
True
False

7. The process of choosing an appropriate transformation is usually iterative: Try a transformation to see whether it makes the association more linear.
True
False

8. You should only compare r2 between regression equations that use the same observations and same response.
True
False

9. You should only compare r2 between regression equations that use the same observations and same response.
True
False

10. A visual comparison requires showing each equation on its own plot.
True
False

11. A visual comparison requires showing each equation on its own plot.
True
False

12. Often the nonlinear pattern is less distinct in the residual plot than in the scatterplot.
True
False

13. Often the nonlinear pattern is less distinct in the residual plot than in the scatterplot.
True
False

14. The slope in an equation that transforms both x and y using logs is known as the elasticity of y with respect to x.
True
False

15. The slope in an equation that transforms both x and y using logs is known as the elasticity of y with respect to x.
True
False

16. The elasticity of y with respect to x describes…
how small percentage changes in x are associated with small percentage changes in y.
how small percentage changes in y are associated with small percentage changes in x.
how changes in y effect changes in x.
how changes in x effect changes in y.

17. The elasticity of y with respect to x describes…
how small percentage changes in x are associated with small percentage changes in y.
how small percentage changes in y are associated with small percentage changes in x.
how changes in y effect changes in x.
how changes in x effect changes in y.