"What proportion of the variation in the evaporation coefficient is explained by the variationin the air velocity? Justify your answer."

I think its talking about the alpha (evaporation) and beta(velocity) coefficients and residual/regression MS i am not sure how to approach this question i am given excel outputs. Is this reffering to the F ratio of F= Between treatment MS/ Residual MS ?

can anyone point me in the correct direction?