Which graph would be most appropriate to compare the sizes of several categories across different groups?

• A. Stem and leaf plot
• B. Bar graph
• C. Circle graph
• D. Histogram

Answer: (B)

Bar graphs are ideal when you want to compare how big different categories are across multiple groups. Each category has a bar whose height represents its size, and you can place bars for different groups side by side in clusters. This layout makes it easy to see which category is largest in each group and how the categories compare across groups. Other graph types serve different purposes: stem-and-leaf plots show the distribution of a single dataset, circle graphs (pie charts) illustrate parts of a whole within one group, and histograms show the distribution of continuous data across value ranges. Because you’re comparing several categories across different groups, the bar graph provides the clearest, most direct comparison.