Statistics Dictionary

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Double Bar Chart

A double bar chart is similar to a regular bar chart, except that it provides two pieces of information for each category rather than just one. Often, the charts are color-coded with a different colored bar representing each piece of information.

Above, a double bar chart shows customer satisfaction ratings for different cars, broken out by gender. The blue rows represent males; the red rows, females.

Both groups prefer the Japanese cars to the American cars, with Honda receiving the highest ratings and Ford receiving the lowest ratings. Moreover, both genders agree on the rank order in which the cars are rated. As a group, the men seem to be tougher raters; they gave lower ratings to each car than the women gave.

See also:   AP Statistics Tutorial: Comparing Distributions | AP Statistics Tutorial: Bar Charts and Histograms