1. Warm Up Practice 6-5 (p. 78) #13, 15, 16, 18, 22, 25, 26, 27, 31 – 36
In the Practice Workbook…
Practice 6-5 (p. 78)
#13, 15, 16, 18,
22, 25, 26, 27,
31 – 36

2. Questions?

3. Line of Best Fit
Objective: To learn to write an equation for the line of best fit for a set of data and use it to make predictions.
scatter plot – a graph that relates two different sets of data. Displayed as ordered pairs.
correlation – describes the strength of a relationship between two variables.
trend line – a line on a scatter plot drawn near points that show correlation.
line of best fit – the most accurate of the trend lines.

4. Correlation & Trend Line

5. Equation of Trend Line

6. Scatter Plot & Finding the Line of Best Fit
1) Turn on plot:
Press [2nd] [Y=], [ENTER], Highlight “On”,
Press [ENTER]  
2) Turn on diagnostic:
Press [2nd] [0] (for catalog),
Scroll down to find DiagonsticOn.
Press [ENTER], [ENTER] .

7. Scatter Plot & Finding the Line of Best Fit
3) Clear Lists (if needed): Press [STAT], [ENTER] (for EDIT), Highlight L1 (at top) Press [CLEAR], [ENTER] . Repeat for L2. 4) Enter data values: Enter x-values (independent) in L1 Enter y-values (dependent) in L2

8. Scatter Plot & Finding the Line of Best Fit
5) Graph scatter plot: Press [ZOOM], 9 (zoomstat) 6) Find equation for line of best fit: Press [STAT], over to CALC, For Linear Model - Press 4: LinReg(ax + b) Press [ENTER], [ENTER] Now you should see…

9. Scatter Plot & Finding the Line of Best Fit

10. Line of Best Fit

14. Assignment
In the textbook: pp
#6 – 13, 16, 17

15. Questions?