Add ability to add polynomial (or at least quadratic) trendline via elements for a scatter plot
Scatter plots for Scientific data measured by students often fit a parabola shaped trendline, i.e. a polynomial trendline with an order of 2. If supporting a polynomial trendline like desktop Excel is too computationally intensive, how about at least supporting a quadratic trendline (i.e. polynomial or order 2) inlcuidng the ability to show the equation and r-squared value. This would allow students to use iPad Excel to make predictions from data analysis done with the iPad.