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Which type of sampling is one where only the first sample unit is selected at random and the remaining units are automatically selected in a definite
sequence at equal spacing from one another. It is:

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SSC CGL Tier-II ( JSO ) 2016 Official Paper ( Held On : 2 Dec 2016 )
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  1. Multi stage sampling
  2. Quota sampling
  3. Systematic sampling
  4. Area sampling

Answer (Detailed Solution Below)

Option 3 : Systematic sampling
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Detailed Solution

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Explanation

Systematic sampling = In this sample members from a large population are selected according to a random starting point but with a fixed, periodic interval and this interval is called sampling interval(k)

The sampling interval = Population size/sample size = N/n.

Quota sampling = It is non prbbaility version of stratified sampling. In this assembled sample has the same proportions of individuals as the entire population with respect to known characteristics, traits.

Multi stage sampling = It is the taking of samples in stages using smaller and smaller sampling units at each stage. It can be a complex form of cluster sampling.

Area sampling = It is sometimes referred to as block sampling, especially in the United States. It is also a form of cluster sampling. Evaluation. Area sampling is used a great deal in countries where there are no adequate population lists, which are replaced instead by maps.

∴ Option 3 is correct

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