In the analysis of variance, the blocks mean square is equal to the sum of the squared deviations between each block sample mean and the grand mean, multiplied by the number of observations made for each block, multiplied by the number of observations per cell (which may well equal 1).

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The blocks mean square in analysis of variance is calculated by dividing the sum of squared deviations between each block sample mean and the grand mean by the degrees of freedom for blocks, not by multiplying by the number of observations.

In the Analysis of Variance, the Blocks Mean Square Is