Unformatted text preview: ith a
compass. The size of the radius depends upon the available space
and other factors of presentation. The third step is to measure
points on the circle and representing the size of each sector with the
help of a protractor.
Draw a Pie diagram for the following data of production of sugar in
quintals of various countries.
77 Production of
Sugar (in quintals)
The values are expressed in terms of degree as follows.
Production of Sugar
Pie Diagram Cuba
Egypt 5.5.3 Three-dimensional diagrams:
Three-dimensional diagrams, also known as volume diagram,
consist of cubes, cylinders, spheres, etc. In such diagrams three
things, namely length, width and height have to be taken into
account. Of all the figures, making of cubes is easy. Side of a cube
is drawn in proportion to the cube root of the magnitude of data.
78 Cubes of figures can be ascertained with the help of logarithms.
The logarithm of the figures can be divided by 3 and the antilog of
that value will be the cube-root.
Represent the following data by volume diagram.
Number of Students
The sides of cubes can be determined as follows
2 cm 4 cm Undergraduate 3 cm Postgraduate 2 cm professional 5.5.4 Pictograms and Cartograms:
Pictograms are not abstract presentation such as lines or bars
but really depict the kind of data we are dealing with. Pictures are
attractive and easy to comprehend and as such this method is
particularly useful in presenting statistics to the layman. When
Pictograms are used, data are represented through a pictorial
symbol that is carefully selected.
Cartograms or statistical maps are used to give quantitative
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