Statistics are a set of numerical data. They relate to a particular characteristic in an enquiry. Collection of these facts and figures forms the beginning of the enquiry. The person who collects the information is called the Investigator or enumerator.
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The activities of an organisation rest upon collection of factual data and information. The statistical investigator collects the primary data from the original sources and secondary data are collected from the published sources. Various methods of collection of primary data are: