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PMID 19610133

As usually happens when I start reading, I wanted to write

Taking into account the set level of statistical significance (0.05), the desired statistical power (0.80) and a moderate influence factor (effect size, d=0.5), the minimum sample size for the Wilcoxon Rank Sum test was 134 subjects divided into two groups, and for multiple regression analysis with, for example, 10 predictors, 118 respondents

For consumers, this effectively means: You cannot legally ship vapes through FedEx or UPS as a private individual