Demographic data collection by census department of India is based on which type of sources ?

Question

Accepted Answer

The correct option is 1:

The Census of India, conducted by the Registrar General and Census Commissioner of India, is the most massive governmental data collection exercise in the country, aiming to enumerate every person residing within India. By definition, a primary source of data is one collected directly from the original source or field by the investigator or agency responsible for the research or statistics. Since census enumerators go door-to-door, interviewing households and recording data for the first time, this process constitutes direct, firsthand collection, making the census a classic example of a primary data source for demographic and socio-economic information.

The incorrect option is 2:

A secondary source is data that has already been collected and published by an agency other than the user. While economists or researchers might use the *published* census data as a secondary source, the *collection* method itself, as performed by the Census Department, is primary.

The incorrect option is 3:

Interpolation is a statistical method used to estimate values that lie *between* known data points. This technique is used for analyzing or adjusting the collected data, not for the original collection process itself.

The incorrect option is 4:

Extrapolation is a statistical method used to estimate values that lie *beyond* the range\* of collected data, such as projecting population figures for future years. Like interpolation, this is a method of estimation and analysis applied *after* primary collection, not a source of data collection.