1. Pre-Algebra
Q3W4: Scatter Plots and Lines of Best Fit

2. Objective
I can draw a “line of best fit” on a scatter plot and make predictions based on the closeness of the data points to the line.

3. Little or no correlation
Positive correlation
Negative correlation
Little or no correlation

4. Scatter plots provide a convenient way to determine whether a(an) ___________ exists between two variables.
A __________ association/correlation occurs when both variables increase.
A ___________ correlation occurs when one variable increases and the other variable decreases.
If the data points are randomly scattered there is no association/correlation.

5. Sometimes points on a scatter plot are represented by
a “trend line” which we also call a _______________________.
You can study the line to see how the data behaves, and make predictions based on what you know.
Let’s Practice!

6. If the data points are close to the line of best fit,
it is said to have a ___________correlation.
strong positive
weak positive
strong negative
weak negative

10. Practice!
Let’s practice using the line of best fit to make predictions.

11. Bobby’s Trip

12. Worksheet

14. Q3W4-5: Study Island 6b “Best-Fit Linear Models
Log in: username: firstnamelastname
Password: ocs+student ID