1. Scatter Plots and Equations of Lines Chapter 6 Section 7

2. Trend Line - a line that shows a positive or negative correlation between two sets of data. Negative correlation (-1) Positive correlation (1) The data is not linear, but has a pattern that is some what linear. No correlation (0) Line of best fit – the trend line that shows the relationship between two sets of data most accurately.

3. To draw a line of best fit and write an equation 1Draw a scatter plot 2Use a ruler to draw a trend line *there should be about the same # of pts above and below the trend line 3Estimate 2 points on the Trend Line 4Find the slope and y-intercept 5Write the equation

4. hrs studied Test grade 042 174 287 399 (2.5,95) (.5,55) m = 20 b = 42 y = 20x + 42 This equation models grades earned

5. Anyone, ah, confused?

6. Assignments Class Work Page 352 – 353#1 – 6, 7 – 11 use graph calc Page 354#12 – 15, 16 & 17 graph calc Page 355#18 (use internet if need) #19 graph calc Homework Page 356 #30 – 35; #9 from Checkpoint Quiz 2