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Sampling, Ethics and Practical Issues

Simple random and systematic random sampling

  • 3 things to know
  • AS Unit 2 and A2 Unit 4

Overview

Simple random sample, systematic random sampling and risk of periodicity in systematic sampling.

What you need to know

Answer each one before you reveal it.

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Key term

What is a simple random sample?

Evaluation

Give one advantage of simple random sampling.

Evaluation

Give one disadvantage of simple random sampling.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a simple random sample?

    Model answer

    A sample in which every member of the sampling frame has an equal chance of being selected.

  2. 2

    How is a simple random sample usually drawn in practice?

    Model answer

    By numbering everyone on the sampling frame and selecting numbers using a random number generator.

  3. 3

    Give one advantage of simple random sampling.

    Model answer

    Selection is free from researcher bias because chance alone decides who is included.

  4. 4

    Give one disadvantage of simple random sampling.

    Model answer

    By chance it may under-represent a small group in the population, so the sample can still be unrepresentative.

  5. 5

    What is systematic random sampling?

    Model answer

    Selecting every nth person from the sampling frame after a random starting point.

  6. 6

    If a researcher wants a sample of 100 from a list of 2,000, what sampling interval should they use?

    Model answer

    Every twentieth person, because 2,000 divided by 100 is 20.

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