Researchers collected data on 76 brands of cereal at a local supermarket. For each brand, the sugar content (grams per serving) and the shelf in the store on which the cereal was located (1 = bottom, 2 = middle, 3 = top) were recorded. A dotplot of the data is shown here.

a. Is the variability in sugar content of the cereals on the three shelves similar or different? Justify your answer.

b. Critics claim that supermarkets tend to put sugary cereals where kids can see them. Do the data from this study support this claim? Justify your answer. Note that Shelf 2 is at about eye level for kids in most supermarkets.

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3 : ... : 6 8 10 12 14 16 Sugar content (grams per serving) 2. 2. Shelf