1. Graphs and Graphing Data Biology Ms. Haut

2. Introduction to Graphing Both figures display the same information, but differently. Which figure is easier to understand? If you need specific data (exact number) which figure would you use?

3. Steps to Making a Graph 1.Identify the Variables

4. –Variable: A factor in an experiment. Independent variable: The factor that is different between groups. The topic of interest in an experiment. Has two or more levels. Levels can be number (age, weight, etc.) or categories (gender, color, etc.) On graphs, the independent variable always goes on the X-axis. Derby, S. (2004) Graphs and Graphing PowerPoint Presentation. Experimental Variables

5. –Variable: A factor in an experiment. Dependent variable: The factor being measured in the experiment. Almost always numerical On graphs, the dependent variable is always on the Y-axis. Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.

6. Steps to Making a Graph 1.Identify the Variables 2.Determine which type of graph to use

7. Types of Graphs Two common types of graphs: – Bar graphs – Line graphs Derby, S. (2004) Graphs and Graphing PowerPoint Presentation. Fig. 1 Fig. 2

8. Derby, S. (2004) Graphs and Graphing PowerPoint Presentation. Types of Graphs Bar graphs are used when the independent variable has categories. Boys/girls Adults/children Salt water/distilled water /tap water Etc. Fig. 1

9. Types of Graphs Line graphs are used when the independent variable has numbers. Hours of television watched Age (in years) Calories eaten per day Etc. Both line graphs and bar graphs show the relationship between independent variables and dependent variables. Derby, S. (2004) Graphs and Graphing PowerPoint Presentation. Fig. 2

10. Steps to Making a Graph 1.Identify the Variables 2.Determine which type of graph to use 3.Choose a scale for each axis that includes all values. Number your gridlines evenly.

11. Derby, S. (2004) Graphs and Graphing PowerPoint Presentation. Making a Graph Choose a scale for each axis that includes all values. Number your gridlines evenly. Fig. 3

12. Steps to Making a Graph 1.Identify the Variables 2.Determine which type of graph to use 3.Choose a scale for each axis that includes all values. Number your gridlines evenly. 4.Label the X-axis and the Y-axis with units

13. Derby, S. (2004) Graphs and Graphing PowerPoint Presentation. Making a Graph Label both axes, including units. Fig. 3

14. Steps to Making a Graph 1.Identify the Variables 2.Determine which type of graph to use 3.Choose a scale for each axis that includes all values. Number your gridlines evenly. 4.Label the X-axis and the Y-axis with units 5.Plot the Data Points and Connect the dots or draw the bars (USE A RULER)

15. Making a Graph Plot each data point and connect your dots with a line. Derby, S. (2004) Graphs and Graphing PowerPoint Presentation. Fig. 3

16. Steps to Making a Graph 1.Identify the Variables 2.Determine which type of graph to use 3.Choose a scale for each axis that includes all values. Number your gridlines evenly. 4.Label the X-axis and the Y-axis with units 5.Plot the Data Points and Connect the dots or draw the bars (USE A RULER) 6.Give your graph a proper title.

17. Making a Graph Give your graph a descriptive title. Derby, S. (2004) Graphs and Graphing PowerPoint Presentation. Fig. 3