Sampling method comparison

A question is this type if and only if it requires comparing advantages and disadvantages of different sampling methods or explaining why one method is preferred over another.

2 questions · Easy -1.3

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Edexcel S3 2003 June Q1
8 marks Easy -1.8
  1. Explain how to obtain a sample from a population using
    1. stratified sampling,
    2. quota sampling.
    Give one advantage and one disadvantage of each sampling method.
Edexcel S3 2012 June Q2
8 marks Moderate -0.8
2. A lake contains 3 species of fish. There are estimated to be 1400 trout, 600 bass and 450 pike in the lake. A survey of the health of the fish in the lake is carried out and a sample of 30 fish is chosen.
  1. Give a reason why stratified random sampling cannot be used.
  2. State an appropriate sampling method for the survey.
  3. Give one advantage and one disadvantage of this sampling method.
  4. Explain how this sampling method could be used to select the sample of 30 fish. You must show your working.