Determining the sample size for a statistical study is an important aspect of a quality research design; it is also a difficult process (Lenth, 2001). Several methods for determining sample sizes for ANOVA, MANOVA, and other analyses exist, including the power approach, the random sampling formula, and a priori estimation. Each of these methods requires the researcher’s knowledge of the effect size and power and is used before data for a particular statistical study is collected. When used with careful consideration and planning, these methods are effective tools.