1. SECTIONS 2.5-2.5B Chapter 2

2. Objectives To draw scatter plots. To find and use prediction equations. Using a graphing calculator to graph lines of regression.

3. Scatter Plot Time (in minutes)Depth (in cm) 27 48 613 819 1020 1224 1432 1637 1838 2041 2247 Emily measured the depth of water in a bathtub at two-minute intervals after the tap was turned on. The table shows her data. Make a scatter plot for the data.

4. Scatter Plot How do we create a scatter plot? 1. If a table is not created, create a table containing all the data. 2. Plot each row of your data as (x, y) coordinates.

5. Scatter Plot Time (in mins) Depth (in cm) 27 48 613 819 1020 1224 1432 1637 1838 2041 2247

6. Objectives To draw scatter plots. To find and use prediction equations. Using a graphing calculator to graph lines of regression.

7. Scatter Plot A scatter plot is a graph made by plotting _______________ in a coordinate plane to show the ______________ between two sets of data. ordered pairs relationship When real-life data is collected, the points graphed usually do not form a straight line, but may ____________a linear relationship. When this is the case, a ____________ can be drawn. approximate best-fit line

8. Best-fit Line

9. Prediction Equation A prediction equation can be found by using a similar process that we have used to determine an equation of a line when given two points. We can use the predication equation to estimate, or _______, one of the variables given the other. predict

10. Prediction Equation Steps: 1. Find 2 points on your best-fit line. 2. Find the slope 3. Use point-slope form (4, 8) and (18, 38)

11. Objectives To draw scatter plots. To find and use prediction equations. Using a graphing calculator to graph lines of regression.

12. Graphing Technology You can use a graphing calculator to draw scatter plots and a line that best fits the points in the scatter plot. This line is called a regression line.

13. Exercises On page 102, complete #1-3 on a separate sheet of paper and hand in.

14. Objectives To draw scatter plots. To find and use prediction equations. Using a graphing calculator to graph lines of regression.