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4.1 Smoothness vs Harshness Premium cigarettes usually go down smoother

It is perhaps worth noting in passing that if two miniature cards were included in each pack of 10 cigarettes, and assuming the unlikely proposition that the collector had no duplicates, he/she would have to buy (if not smoke) a minimum of 260 cigarettes to collect one single pack of miniature cards

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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