Question

What are:
(i) Primary data?
(ii) Secondary data?
Which of the two—the primary or the secondary data—is more reliable and why?

Answer 1

i) :-Primary data is data that is collected by a researcher from first-hand sources, using methods like surveys, interviews, or experiments

ii) :- Secondary data refers to data that is collected by someone other than the user.

Answer 2

answer :

A common classification is based upon who collected the data. Primary data: Data collected by the investigator himself/ herself for a specific purpose. ... Secondary data: Data collected by someone else for some other purpose (but being utilized by the investigator for another purpose).