Understanding Effect Sizes In User Research

Jeff Sauro • March 11, 2014
The difference is statistically significant. When using statistics to make comparisons between designs, it’s not enough to just say differences are statistically significant or only report the p-values. With large sample sizes in surveys, unmoderated usability testing, or A/B testing you are likely to find statistical significance with your comparisons. What you need to know is how big of a difference was detected. The size of the difference gives you a better idea about the practical significance and impact of the statistical result. [article]

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