Diagrammatic and Graphical Presentation

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  • Q1

    Explain the main advantages of diagrams.


    Following are the main advantages of diagrams:

    i) Attractive and popular – Even a layman who has no statistical background can understand diagrams easily. Diagrams are popular in various fields viz. economic, social, and political and other areas. ‘A picture is worth 1000 words’ seems to be very true to the context of diagrams.

    ii) Diagrams are more effective than the tables as they have more lasting effect on the mind.

    iii) Diagrams help us to make comparative studies.

    iv) Diagrammatic presentation is economical in time, labour and money.

    v) Diagrams help in forecasting the future trend.

    vi) Because of its simplicity, attractive presentation and entertainment values diagrammatic presentation of data has a universal acceptability.

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  • Q2

    What is meant by diagrammatic presentation of data? what are the general rules that should be observed while constructing diagrams?


    Diagrammatic presentation is a technique of presenting data in the forms of diagrams such as bar diagrams, rectangles and pie chart etc. Diagrammatic presentation is the most popular and common for representing the statistical data in an attractive manner.

    Diagrams help us to visualise the whole meaning of numerical complex at a single glance. The following general rules should be observed while constructing diagrams –

    i) Attractive i.e. neat and clean with minimum use of words and with a Proper size.

    ii) Title should be suitable.

    iii) Selection of scale i.e. the diagram should be drawn to proper and accurate scale.

    iv) Foot note should be given at the bottom of the diagram.

    v) Indexing is important to make the observation clear.

    vi) The diagrams should be constructed either from left to right or from bottom to the top.

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  • Q3

    ‘Diagrams are less accurate but more effective in representing the data than tables” – Explain?


    One of the limitations of diagrams is that diagrams are not exact as table because they give only an approximate idea. Hence, diagrams are not suitable where greater accuracy is desired. However, the most important advantage of diagrams is that diagrams are more effective in representing the data than tables because diagrams facilitate the understanding of salient features of the data.

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  • Q4

    What is Ogive? Illustrate the types of Ogive with graphical presentation.


    Ogive means a cumulative frequency curve for a given set of data. Depending on cumulative frequency, there are two types of ogive: Less than & More than.

    Less than Ogive: Less than Ogive Curve is plotted against respective upper limits of class interval.

    More than Ogive: More than Ogive Curve is plotted against respectively lower limits of the class interval.

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  • Q5

    How can you classify the Geometric diagram?


    Geometric diagram can be classified in two types: Bar diagram & Pie diagram.

    Bar Diagram: The bar diagram is very simple to present. Bars must be of uniformly thick. Bar diagram can be of three types: Simple, Multiple & Component.

    Pie Diagram: This diagram can show both total and component sector. The area of a circle of pie diagram is proportional to the square of its radius. The value in this method is used on a percentage basis and not on an absolute basis.

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