Final answer:
The statement is true; bar charts can be applied at different levels for data representation, including absolute numbers, percentages, or comparative figures. For example, data can be displayed in multiple bar graph formats which include actual numbers, shading differences, and percentage divisions. Choosing between pie graphs and bar graphs depends on the nature of the data and the clarity of the presented information is key to avoid display problems.
Step-by-step explanation:
The statement that bar chart presentation of data can be applied at different levels is true. Bar charts can represent data in various ways, such as absolute numbers, percentages, or comparative figures across different groups or time periods. For example, in Figure A8 described in the question, population data is represented in three different styles of bar graphs: (a) displays absolute numbers for different age brackets per year, (b) represents the same data with a single bar per year and shades for different age groups, and (c) presents data as percentages of the total on the vertical axis, where all bars have the same height and each bar is divided according to the percentage of the population in each age group.
When choosing between a pie graph and a bar graph for presenting data, a pie graph is typically utilized when displaying parts of a whole and is best for visualizing proportions or percentages. In contrast, a bar graph would be more suitable for showing actual counts or values and allows for easy comparison across categories. To avoid potential display problems with pie graphs, ensure the colors are clear and consistent, percentages are legible, and the chart is large enough to display smaller sections accurately. For bar graphs, it's important to maintain a clear and legible scale and to order the bars in a meaningful way, such as chronologically or by size.