The paper “Caffeinated Energy Drinks—A Growing Problem” (Drug and Alcohol Dependence

[2009]: 1–10) gave the accompanying data on caffeine per ounce for eight top-selling energy drinks and for 11 high-caffeine energy drinks:

Top-Selling Energy Drinks 9.6 10.0 10.0 9.0 10.9 8.9 9.5 9.1 High-Caffeine Energy Drinks 16.3 31.3 30.0 The mean caffeine per ounce is clearly higher for the highcaffeine 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.