Mean Square (from Internet Glossary of Statistical Terms)
Statistics Explained
Mean Square

In an ANOVA, the term Mean Square refers to an estimate of the population variance based on the variability among a given set of measures.

In a one way ANOVA, the Within Mean Square is an estimate of the population variance based on the average of all s-square within the several samples.

In a one way ANOVA the Between Mean Square is an estimate of the population variance based on the s-square of the sample means multiplied by n (the size of the samples).

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