1. Relationships

2. Which graph fits the description best?
The relationship between x and y is a strong, positive linear relationship. A B C D

3. Which graph fits the description best?
The relationship between x and y is a weak, positive linear relationship. A B C D

4. Which graph fits the description best?
The relationship between x and y is a scattered relationship. A B C D

5. Explanatory v. Response
You are working for Apple and are investigating customers buying habits. You want to see if how many ipods a customer owns will affects the number of ipads they will purchase.
What is the Explanatory Variable?
What is the Response Variable?
What kind of a relationship will you expect?

6. Slope 𝑆 𝑦 𝑆 𝑥 * r = slope for the line of best fit
Line of best fit: y = mx + b

7. Interpret Slope
Create a general sentence that explains what the slope means
As X increases by one unit, Y will increase by Slope units.

8. Y-intercept Line of best fit: y = mx + b
What is an x and y you could use in the equation?

9. Interpret intercept What does x equal at the y-intercept?
Create a generic sentence that explains what the intercept means
When X equals zero, Y equals intercept

10. R-squared Write a generic sentence that explains what R-squared means?
( 𝑅 2 ∗100)% of the variance in Y can be explained by X

11. Which graph matches the 𝑅 2 value
𝑅 2 =1 A B C D

12. Which graph matches the 𝑅 2 value
𝑅 2 =0.13 A B C D

13. Which graph matches the 𝑅 2 value
𝑅 2 =0.64 A B C D

14. Apple You obtain the following results Describe the relationship
# of ipods
# of ipads 1 4 2 3 5
You obtain the following results
Describe the relationship

15. Apple
𝑦 =−0.55𝑥+3.19 𝑅 2 =0.212