The paper “Caffeinated Energy Drinks—A Growing Problem” (Drug and Alcohol Dependence : 1–10) gave the accompanying data on caffeine per ounce for eight top-selling energy drinks and for 11 high-caffeine energy drinks:
The mean caffeine per ounce is clearly higher for the high caffeine energy drinks, but which of the two groups of energy drinks (top-selling or high-caffeine) is the most variable with respect to caffeine per ounce? Justify your choice.
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