Graphs are drawn to show experimental data obtained during a scientific investigation.
It is important to consider the following when drawing a graph:
- The x-axis should be labelled (with the independent variable) and include appropriate units.
- The y-axis should be labelled (with the dependent variable) and include appropriate units.
- A suitable scale should be used that is even and results in the graph taking up at least half of the page.
- The plots should be accurately plotted.
- The plots should be joined with the appropriate straight line or curve.
Graphs are then used to identify trends or relationships present within the experimental data.