Regarding effect size, all of the following statements are true, except:

	1.	Effect size is a measure of the magnitude of the significant variance difference.
	2.	Effect sizes are expressed as a standard score, in other words, interpreted in standard deviation units (typically in absolute value terms) from zero.
	3.	Effect size is calculated when the pairwise difference is found to be significant.
	4.	Effect size is a measure for expressing the practical importance of the difference between sample means.