1. Unit 1 Most common: Line Graph
Constructing a Graph
Unit 1
Most common: Line Graph

2. 1. ID Variables Independent Variable
Goes on the X axis (_________)
Should be on ________side of data table.
Dependent Variable - (changes w/ IV)
Goes on the Y axis (________)
Should be on _______side of data table.

3. 2. Determine Variable Range
Subtract the lowest data value from the highest data value.
Do each variable separately.

4. 3.Determine Scale of Graph
Determine a scale: numerical value for each square, best fits range of each variable
Spread graph to use MOST available space.

5. Number and Label Each Axis
This tells what data the lines on your graph represent.

6. Plot the Data Points Plot each data value on the graph with a dot.
You can put the data number by the dot, if it does not clutter your graph.

7. Draw the Graph Draw a curve or a line that best fits the data points.
Most graphs of experimental data are not drawn as "connect-the-dots".

8. Title the Graph
Your title should clearly tell what the graph is about.
If your graph has more than one set of data, provide a "key" to identify the different lines.

9. BAR Graphs
If either dependent (DV) or Independent (IV) variable are NON-numeric (qualitative)
Used to compare things btwn different groups
If there is >1 set of data you need to have more than one bar

10. CIRCLE (PIE) Graphs If both DV and IV are NON-numeric
Use when DV or IV is in % or when comparing PARTS to a WHOLE
Should be presented in order, largest to smallest, to make it easier to interpret figures

11. LINE Graphs If BOTH DV and IV are numbers (quantitative)
Show a trend or change over time
If >1 set of data you need >1 line

12. Practice Graphing Open “Constructing a Graph” PP Go to slide show
Click here on: Practice Graphing Here

13. In groups: Complete Practice Interpreting Data #1-10
Complete Tadpole population
A line graph may be made in Microsoft Excel or at Create a Graph
Print Graph and answer the questions