In order to determine how much two means must differ for this difference to be considered "real and not due to chance,we must use a procedure known as percent variance.

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In order to determine how much two means must differ for the difference to be considered "real and not due to chance," we actually use a statistical test called hypothesis testing, typically with a significance level of 0.05 or 0.01. Percent variance is not a procedure used to determine the difference between two means.

In Order to Determine How Much Two Means Must Differ