How can we identify the proportion of variance accounted for by a given predictor in a regression problem?
Explain this as a ratio of variances.
Compare R², the ratio of SStreatment/SStotal.

a) By calculating the ratio of the variance explained by the predictor to the total variance in the model
b) By calculating the ratio of the within-group variance to the total variance in the model
c) By calculating the ratio of the between-group variance to the total variance in the model
d) By calculating the ratio of the explained variance to the residual variance