I am doing some calculations for my statistical and experimental design course.

I did some calculations this morning following the teachers notes. These checked out with the software's analysis, so no mistakes were made with the software data entry or the calculations that I did with a word processor and a calculator. The data relate to a machine tool process involving speed of the tool, geometry, and cuting angle. I am supposed to figure out which has more effect on the life of the tool which is our response variable.