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104
visuals which they have had no time to absorb. Now that everyone can use
PowerPoint, being expert in its use is less impressive than once it might have been.
Remember that you are trying to communicate effectively. Be selective and use slides
when you need to.
4. Comprehension of Visual presentations
Here we will consider tables and four different kinds of diagram: pie charts, bar
charts, Gantt charts and graphs.
a. Tables
A collection of figures can often best be communicated by means of tables.
The table below shows the results of a survey to find out what members of a city
sports club think about the club’s activities, facilities and opening hours.
Range of
activities
Very satisfied Satisfied Not satisfied
Female members 35% 35% 30%
Male members 55% 40% 5%
Club facilities
Female members 64% 22% 14%
Male members 63% 27% 10%
Opening hours
Female members 72% 25% 3%
Male members 44% 19% 37%
b. Pie charts
Statistics that are reported in percentages are often presented in what is called a
pie chart, in which the complete “pie” represents 100 percent. The distinctions can be
heightened by shading or colouring the different segments of the pie. The pie chart
shown below indicates the government expenditure (%).
c. Bar charts
Another way of expressing data visually is by means of bar charts. To show
data in the form of bar charts, the bar charts are drawn to scale and measured from
the base line which may be horizontal or perpendicular. The following bar charts
show the sales of the different product lines of the company (Delta Food Products)
over the past year.
Horizontal bars
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