Very often, we want to extract from the graph the relationship between ordinate and abscissa. In the previous case, it is a linear relationship, and we can ask the software to calculate the best fit line, or the line that best approximate the relationship between position and time. This line is calculated from the position of your data points. In order to find this best fit you must control-click (or right-click) on a data point and choose add trendline.
The following window appears:
Since the relationship between position and time is a straight line, you must choose linear. In some cases you will also use 2nd order polynomial (a parabola), or an exponential. In any case, you should KNOW what the relationship is BEFORE choosing the type of fit. You should never "fish" for the correct relationship.
Now click on the option submenu and select Display equation on chart. This will write the equation of the best fit line on the graph.
This is your graph:
You can now move the equation to a suitable place in the graph area and increase it’s font size or change the number of significant figures by double-clicking on the equation. Your graph is now done. For your lab reports, print the graph on a separate page, in the landscape format, so it is as big as possible.