1. I need to use which graph?
Graphing
I need to use which graph?

2. Types of Graphs
We will use one of 3 kinds of graphs: line graph, pie graph, and bar graphs
Line graphs are good a representing changes over time, when the data is continuous
Bar graphs are used for comparison of quantities that are not fixed
Pie graphs compare the parts of a whole
Be sure to use the appropriate graph for the given data

3. Variables
The independent variable goes on the X-axis (remember this is the variable that the experimenter chooses)
The dependent (sometimes called responding) variable goes on the Y-axis (remember this happens as a result of the independent variable
As a general rule, time should go on the X-axis

4. Special Cases (line graphs)
Any straight line indicates that the 2 variables are in direct proportion (draw example on board) that is when the 2 variables are in a constant ratio
A curved line could indicate a inverse proportion line graph where the product of the 2 variables is always equal
Slope is difficult to measure on a curved line, so if we find slope we will do it on a straight line