Probability sampling method

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 Simple random sampling:


  • A random sample is a sample when each item in the universe has an equal and known opportunity of being selected. 

  • Providing chance, and only chance, determines which items are to be included in the sample chosen. 

  • Selection by chance enables us to make use of the concept of probability, which is the foundation upon which sampling theory rests.



Multi-phased sampling:


  • In this method, Samples of different sizes are selected in different phases. 

  • For example, in the first phase, we will select 1, 00,000 families to collect information on income and expenditures.

  • In the second phase again we will select 5000 families to collect information in details about source of their income, debt, savings, type of expenditures, expenditures on food, education, health etc. 



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