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Unit 4: Presentation of Data

Before the choice of a suitable diagram, it is very necessary to know the level of education of the Notes
person for whom the diagram is to be suitable. Further, if the data are related to different
geographical areas, the cartograms may be the most appropriate drawn. For persons with little
knowledge of statistics, the pictograms or cartograms may be more choice.

!
Caution The selection of an appropriate diagram should be carefully done keeping in view
the nature of data and objective of investigation.

Self Assessment

Fill in the blanks:
1. Classification and tabulation are the techniques that help in presenting the data in an
............................... form.
2. Diagrams are attractive and ..............................
3. Diagrams ........................ data
4. Diagrams are useful in making ........................
5. Diagrams are liable to be misused for presenting ......................... picture of the problem.

6. A ........................................ is a simple and effective method of presenting the information
contained in statistical data.
7. The construction of a diagram is an ............................. , which can be acquired only through
practice.
8. The choice of a suitable diagram depends upon the ....................... of the given data.

4.2 Bar Diagrams

One-dimensional diagrams are also known as bar diagrams. In case of one-dimensional diagrams,
the magnitude of the characteristics is shown by the length or height of the bar. The width of a
bar is chosen arbitrarily so that the constructed diagram looks more elegant and attractive. It
also depends upon the number of bars to be accommodated in the diagrams. If large number of
items are to be included in the diagram, lines may also be used instead of bars. Different types
of bar diagrams are:

1. Line Diagram
2. Simple Bar Diagram
3. Multiple Bar Diagram
4. Sub-divided or Component Bar Diagram
5. Percentage Sub-divided Bar Diagram
6. Deviation Bar Diagram
7. Duo-directional Bar Diagram
8. Sliding Bar Diagram

9. Pyramid Diagram
10. Broken-Scale Bar Diagram
11. Histogram

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