Theory:

In the previous theory, we have learnt what data is. In this theory, let us learn how to collect the data and to find its type.
 
Data are classified into two types. They are:
  • Primary data
  • Secondary data
Primary data:
The data which are collected directly by ourselves through experiments, surveys, observations, etc., are called as primary data.
    Example:
  • Cost of vegetables in your nearest shop
  • Population census report (Collected and published by population census organization)
Secondary data:
The data gathered from a source that has been already collected in the past by someone else is called secondary data.
    Example:
  • The temperature in the month of April \(2020\)
  • The number of people living in India for the past \(5\) years.