They add variety and forcefulness to a statistical report, and help to produce interest in the facts and figures in the text and tables. Charts and graphs should show a limited amount of data to be effective.
Clarity is the secret of their success.
Keep them as simple as possible-and still get the facts across. You should not restrict yourself to one or two favorite kinds or make them so difficult or obscure that they are hard to understand. In this issue, we will discuss the use of bar charts. The bar chart presents data in the form of bars or columns, arranged either horizontally or vertically on a scale of values. Most often there are two scales, one for the group or class and the other for the percentage or number.