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Jeffrey Witmer

Oberlin College



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129 – Advancing Statistical Literacy

Effect Size Really Does Matter

Sponsor: Section on Statistical Education
Keywords: effect size, p-value, statistics education

Jeffrey Witmer

Oberlin College

The world is awash in p-values. Most introductory statistics courses spend a lot of time helping students understand how to find a p-value, and a good deal of time on thinking about what a p-value means (and doesn't mean). But we almost always know that the null hypothesis is false; what matters in practice is the size of the effect. Effect sizes are just as important as p-values but receive little attention. That should change.

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