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The sum of squares between groups ($$SS_B$$) is an intermediate calculation in an analysis of variance that represents the total variation attributed to the differences among the group means. This value must be computed as a prerequisite step before finding the mean squares between groups.

Sum of Squares Between Groups

The mean squares between groups ($$MS_B$$) is an estimate of population variance based on the differences among the sample means in an analysis of variance. It is calculated by dividing the sum of squares between groups by the between-groups degrees of freedom, and it serves as the numerator for the $$F$$ statistic.

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