Graphs

1. Graphs

2. Why do we use graphs? There are many ways to display information. One way is to draw a line graph. Line graphs are graphs that show the relationship between two different things. People often use line graphs to show change(s) over time. It is much easier to see patterns from a line graph than from a list of data. Line graphs have two axes. The horizontal axis is the independent (manipulated) variable. The vertical axis is the dependent (responding) variable.

3. Let’s review graphing. First you have to draw a graph. How do you draw one? What do you need? You need a vertical line. What do we call that line? You need a horizontal line. What do we call that line? They need to meet at a ___________ angle.

4. Let’s review graphing. We usually label the right angle where the two axes meet with a zero. 0 0

5. Let’s review graphing. • When you look at data, you have to determine which variable is dependent (responding) and which is independent (manipulated). • If you know that then you can graph!

6. Let’s review graphing. • How do you determine these variables? • You need to know which part of the experiment is changing (responding). • Time is often shown on the x-axis.

7. Let’s review graphing. The Y-axis contains the dependent (responding) variable. DRY represents Dependent-Responding-Y-axis. DRY MIX The X-axis contains the independent (manipulated) variable. MIX represents Manipulated-Independent-X-axis.

8. Let’s review graphing. • When you label a graph, you need to choose appropriate units. • If you are creating a graph of how fast a car goes in seconds, you would not want to use days as your time period units and you wouldn’t want to count by one unit for speed. • You often see graphs in increments of 2, 5, and 10 to make graphing easy to draw and read.

9. Let’s review graphing. • To determine which units to use when graphing, you need to look at the range of data (the lowest number and highest number). • If your range of data was 0-150 meters, what would you use for your units? • 0-16 meters?

10. Let’s review graphing. • Units do not need to match on the y-axis and x-axis, but they should be consistent. If you are counting by 2, don’t change to 5 in the middle of graphing. 15 10 8 6 4 2 0 0 1 2 3 4 6 8 10 12 14

11. Let’s review graphing. • Plot the data on the graph as matched pairs. For example, every independent (manipulated) variable number will have a corresponding dependent responding)variable number.

12. Let’s review graphing. • Lastly, don’t forget to include a title with your graph. • If you take the time to correctly label your graph, then viewers will be able to read the information easily.

13. Graphing • To construct a distance-time graph, follow the correct procedures for producing a graph: • Correct placement of dependent and independent variables (DRY-MIX) • Correct labeling of the axes • Title the graph • Correct placement of intervals

14. Graphing How can we use the data in the table to create a line graph?

15. Graphing • Let’s create a graph together. Look back in your notes and let’s decide what we need in order to create a graph for the data?

16. Class Graph Let’s check and see if we correctly labeled the graph by viewing the next slide.

17. Graphing

18. Let’s describe the objects’ movement in the graphs below.