develop a research proposal

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Data Sampling - Systemic Sampling

Systematic sampling

While not truly random this is a method that is used extensively because it is easy to operate and quick, even when the population and the sample are large.

For example, for the population 90 and sample of nine:

Split the sampling frame in to nine equal groups.

i.e.

1 to 9

 

10 to 19

 

etc

 

80 to 89

Select a number between 1 and 9 using random number tables.

Suppose this number is 6.

Person numbered 6 is chosen.

Then the 16th, 26th, 36th, 46th, 56th, 66th, 76th, and 86th people are the remaining sample units.

If no sampling frame is available access to the population is necessary, such as customers of a business such as a leisure center, restaurant or museum.

Systematic sampling can be used by selecting a random number say 25.

Then the 25th person to enter is the first sample unit.

The 50th person to enter is the second sample unit.

This process is carried on until the required sample size is met.

This approach usually generates a good cross section of the population. However, you may need a team of people when no sampling frame exists to help with counting, interviewing, etc.

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