![]() ![]() s 2/x = the variance of the sample means.s 2 pooled = the mean of the sample variances (pooled variance).The between group variability is therefore The sum of squares of all values from every group combined: ∑x 2 n = total number of all the values combined (total sample size: ∑n j). ![]() s j = the sum of the values in the jth group.To calculate the sum of squares and the mean square, let: ![]() MS between is the variance between groups, and MS withinis the variance within groups. To find a “sum of squares” means to add together squared quantities that, in some cases, may be weighted.
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