Bar graphs seem like one of the simplest ways to represent data. Many people assume that the longer the bar, the bigger the number it represents. Sometimes bar graphs represent an average not a total ...

The classic horizontal bar chart is something we’re all familiar with. For many of us, it was the first ‘chart’ we learnt in school, usually alongside Venn diagrams and line graphs. That’s because bar ...

The graph shows the percentage of the US adult population -- both as a whole and by ethnic/racial subgroup -- with diabetes (blue bars) and the percentage who have diabetes that has not been diagnosed ...