Prerequisites: Reviewing Data Collection and Analysis

Here are the basic steps required to create a line graph, the most common graph type you will use in this class.

Step	What...	How...
1	Identify the independent and dependent variables	The independent variable is the one controlled by the person doing the experiment. This variable goes in the left column in the data table and on the x-axis on the graph. The dependent variable responds to the change in the independent variable (if there is a relationship). This variable goes in the right column in the data table and on the y-axis on the graph.
2	Determine the ranges of the variables	Range = highest – lowest You have two ranges because you have two variables.
3	Determine the scales	The scale is the numerical values that you will label each axis with that fits the data well. Use all of the space on the axis.
4	Label each axis	Label each axis with a title and number them using the determined scale. Make sure these are legible.
5	Plot the data	Use your data table to plot the data on the graph.
6	Draw a line-of-best-fit	Using the data points as a judge, draw a line or a curve that represents the data well. Do not connect the dots!
7	Label the graph	Make sure to include a title on the graph. It is usually in the format of “Independent vs. Dependent” or “The Effect of Independent on Dependent.” Also, include a key for the graph if there are multiple data sets represented.

For more information on creating graphs, see the internet sources below or do a search for “how to construct a line graph” or “line graphs.”