If you want to make your charts easy to interpret, insert a trendline or moving average line in Excel worksheet. See the list of steps to get it done in no time!

I have a set of data, which I charted and then used the 'add trendline' tool to get a decent 2nd order poly. fit with the equation: y = -3E-39x^2 + 4E-19x + 3.4212 However, when I type this ...