Is the AVOVA the right test to run here?

Hi There,

I'm currently running that data on a quasi-experiment I conducted, which is part of my dissertation. I'm having some trouble choosing the right test to run.

I want to first assess the equability of my six classroom instructors by examining their overall grade spreads from the previous semester as well as their student evaluations.

I think I need to run an AVOVA test here, but I'm not sure.

When I run an ANOVA in SPSS on the grade spread, for example, I get info on the differences betweens As-Bs, As-Cs, etc. I just want to know if the overall grade spread of all six instructors is significant or not.

I admit I'm pretty clunky at interpreting SPSS results so any help would be appreciated.