See RSM Simplified Chapter 4 if you are interested in the details. The program suggests the cubic model and underlines that line in this table of sequential sum of squares. The extremely low p‐value indicates a highly significant advantage when
adding this level to what’s already been built (mean, linear, and quadratic). Remember to try the screen tips on this screen. Also, try right‐clicking on a given cell to see if the program offers context‐sensitive Help, as it does below.