# What is the interaction between blocks 1 and 3? how about the betweet blocks 3 and 4

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We group experimental units into "homogeneous" blocks where all levels of the main factor are equally represented. The analysis of variance of a Randomized Control Block design splits the residual term of an equivalent single factor Complete Randomized design in block and residual components. We should note, however, that the latter component has fewer degrees of freedom than in single factor CR designs, leading to higher estimates for MSResidual=SSResidual/d.f.MSResidual=SSResidual/d.f..