1. TSW use graphing as a tool in data analysis
Constructing Graphs
TSW use graphing as a tool in data analysis

2. Why do we graph data? Show trends
Imply similarities or differences in data collected during an experiment
Physically/visually represent data

3. 5 Parts of a Graph Title Independent Variable Dependent Variable
Scale for each variable recorded on the axis
A key to the marks, lines, or different types of data

4. 1. Plan out your graph Pre-plan
Use the 75% rule…your graph should cover ¾ of the area provided
Do not extend your graph beyond the limits of the graph paper provided

5. 2. Choose the appropriate type of graph
Line Graphs: Track change over time
Bar Graph: Make comparisons between groups
Pie Chart: Compare parts of a whole

6. 3. Determine your variables
What is the dependent variable and why?
Usually goes on the Y-Axis
What is the independent variable and why?
Usually goes on the X-Axis
What title should your graph have?

7. 4. Determine the scale Play the “Range Game”
Find the highest value for your data set and then count the available spaces on the appropriate axis
Each square must equal the same amount of “X” and “Y” on a given axis
Ex. 2, 4, 6, 8, 10 not 2, 4, 5, 7, 8, 10

8. 5. Plot your points Plot your data points as accurately as possible
Remember: All points do not have to fall exactly on a line…it is okay to estimate and plot a point between lines

9. Other helpful info… Title your graph
Include a legend and label with units if you have multiple lines or bars on your graph
Look hard at your graph…is it clear? Neat? Large enough? Does it show what happened?