Width or size of class 9 mid value 10 frequency 67 5

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Unformatted text preview: . k = 1 + 3.322 log10N 7. 15 and 25 8. width or size of class 9. Mid-value 10. Frequency 67 5. DIAGRAMATIC AND GRAPHICAL REPRESENTATION 5.1 Introduction: In the previous chapter, we have discussed the techniques of classification and tabulation that help in summarising the collected data and presenting them in a systematic manner. However, these forms of presentation do not always prove to be interesting to the common man. One of the most convincing and appealing ways in which statistical results may be presented is through diagrams and graphs. Just one diagram is enough to represent a given data more effectively than thousand words. Moreover even a layman who has nothing to do with numbers can also understands diagrams. Evidence of this can be found in newspapers, magazines, journals, advertisement, etc. An attempt is made in this chapter to illustrate some of the major types of diagrams and graphs frequently used in presenting statistical data. 5.2 Diagrams: A diagram is a visual form for presentation of statistical data, highlighting their basic facts and relationship. If we draw diagrams on the basis of the data collected they will easily be understood and appreciated by all. It is readily intelligible and save a considerable amount of time and energy. 5.3 Significance of Diagrams and Graphs: Diagrams and graphs are extremely useful because of the following reasons. 1. They are attractive and impressive. 2. They make data simple and intelligible. 3. They make comparison possible 4. They save time and labour. 5. They have universal utility. 6. They give more information. 7. They have a great memorizing effect. 68 5.4 General rules for constructing diagrams: The construction of diagrams is an art, which can be acquired through practice. However, observance of some general guidelines can help in making them more attractive and effective. The diagrammatic presentation of statistical facts will be advantageous provided the following rules are observed in drawing diagrams. 1. A diagram sh...
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