Census Method - Data is collected from each and every unit of population , Sampling method - Data is collected from representative items of a population , Primary data - Data collected by the investigator himself for the first time for some specific purpose , Secondary data - Data collected from published or unpublished sources, Information from correspondents - Trained local agents are appointed to provide continuous information , Indirect oral investigation - Information is collected from the third party or witness who possesses information about the subject , Systematic sampling - Every nTH item of numbered items is selected as sample ,

Statistics - Chapter 3 (Collection of Data)

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