The mean frequency of childhood abuse experiences scores I previously computed was 6.4213, and the SD = 4.90851. This score is much greater than one SD above that mean, 6.4213 + 4.90851 = 11.32981 A difference of 0.5 SDs (which would be 0.5*4.90851 = 2.454255) is considered meaningful. This is because it represents a medium effect size. A 2.454255 difference in depression scores between child abuse and threatened others with a gun is likely to be meaningful given that it is a medium effect size compared to an SD = 4.90851 Since the standard deviation is 4.90851, a difference less than 0.2*4.90851 = 0.981702 would be considered unmeaningful. A 0.981702-point difference in depression scores between child abuse and threatened others with a gun is not likely to be unmeaningful, given that it is small compared to an SD = 4.90851 What would it mean if the meaningless difference was 'statistically significant, p < .05