1. Correlation vs Causation
Does one variable cause the other to change OR
Is the data just showing correlation?

2. Correlation Vs. Causation

3. Correlation but not causation

4. Correlation DOES NOT imply causation!!!

5. Lurking Variables
Lurking Variable: A variable that is not the independent variable or the dependent variable but affects correlation
Correlation but not causation

6. Correlation but not causation

7. There were 10 homework assignments in the chapter
There were 10 homework assignments in the chapter. The graph shows the number of assignments each student in the class completed compared to his/her chapter test score.
Causation

8. Correlation but not causation

9. Correlation but not causation

10. causation

11. Correlation but not causation

12. James was the principal at the high school
James was the principal at the high school. He noticed every year that if the team was wearing blue socks, they scored more baskets. So each year he recorded how many blue socks were worn and how many baskets were made in the homecoming game. Results in the table show 6 years of data.
Graph the ordered pairs as a scatter plot (number of blue socks, baskets made)
Is the correlation negative or positive? Explain
Does the data illustrate causation? Explain.
Year 1 2 3 4 5 6
# Blue Socks 7 8
# of Baskets 9 11 13 12

14. Directions: Determine whether each situation illustrates CORRELATION BUT NOT CAUSATION, or CAUSATION.
1. At a flea market, there is a positive correlation between the number of necklaces and the number of toy puppets being sold each day.
2. The positive correlation between the number of miles driven and the amount of gas used.
3. When making orange juice, there is a negative correlation between the amount of water added and the concentration of the orange juice.
4. Negative correlation between average number of hours on face-book and GPA.
No causation
Causation
correlation

15. Homework
Pg 256 #4-6, 8-11, 21-24, 27