Then I have to go to your score. In the graphic we see that the groups differ.
Men are taller than women.
So if a has nonzero values, the groups are different. The F-ratio will tell us how to proceed. Significant F's mean there are some differences . Insignificant F's mean that we did not find any differences . Let's say the groups are the 1 st Year , Sophomores , Juniors and Seniors.