When analysis of variance is used, statistically significant differences may or may not be of practical significance to educators. A large part of the problem is due to the fact that a "zero difference" null hypothesis can always be rejected statistically if the sample size is large enough. If, however, a method based on the noncentral F distribution is used, trivial differences cannot attain statistical significance. The (non-zero) null hypothesis is now rejected at the alpha level when the observed F exceeds the noncentral F cutoff point where the noncentrality parameter delta (sub0) is determined by the minimum practical difference set by the researcher. (Author)