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The Journal of Agricultural Education (JAE) requires authors to follow the guidelines stated in the Publication Manual of the American Psychological Association APA (2009) in preparing research manuscripts, and to utilize accepted research and statistical methods in conducting quantitative research studies. The APA recommends the reporting of effect sizes in quantitative research, when appropriate. JAE now requires the reporting of effect size when reporting statistical significance in quantitative manuscripts. The purposes of this manuscript are to describe the research foundation supporting the reporting of effect size in quantitative research and to provide examples of how to calculate effect size for some of the most common statistical analyses utilized in agricultural education research. Recommendations for appropriate effect size measures and interpretation are included. The assumptions and limitations inherent in the reporting of effect size in research are also incorporated.
Kotrlik et al. (Mon,) studied this question.