Collection of Data
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What are the principal sources of data ?

Principal sources of data are :
(1) Primary sources and
(2) Secondary sources. less expenses.
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    Define primary data.
    Answer

    In India the population census is carried out in every :

    • Three years

    • Five years

    • Ten years

    • Ten years

    Answer
    Define secondary data.
    Answer
    What type of data involves less time and less expenses ?
    Answer
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