1) Data = The facts or figures which are numerical or otherwise collected with a difinite purpose are called date.
2) Statistics = Ectraction of meaing from the data is studied in a brach of mathematics called statistion.
3) Primary Data = The date collected for a definite purpose by an investigator or a group of investigators directly is called primary data.
4) Secondary Data = When a data is collected from a source which had the information stored, the data thus obtained is called a secondary Date.
5) Raw Data = An information of facts and figures collected for a definite purpose in any manner is turned as a Raw Data.
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