Question

Data collected by an investigator himself is called ________ data.

Answer 1

Collection of data:

Data: A collection of facts,such as numbers,words,measurements,observations or even just description of things.

The data, collected by the investigator himself, is called primary data. This kind of data is relevant and most reliable.

Example of primary data: Data collected by census commission for population census.

Hence,Data collected by an investigator himself is called _primary_ data.