What are:
(i) Primary data?
(ii) Secondary data?
Which of the two—the primary or the secondary data—is more reliable and why?
The word ‘Data’ means information. Statistical data are of two types:
(i) Primary data: When an investigator collects data himself with a definite plan or design in his/her mind is called Primary data.
(ii) Secondary data: Data which are not originally collected rather obtained from published or unpublished sources are known as secondary data.