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N2014 P2 Q5

N2014 P2 Q5

Junior College 2
4 marks

An internet retailer has \(10\,000\) regular customers and wishes to carry out a survey using a \(5\%\) sample of these customers.

  1. Describe how the retailer could select a systematic sample.[2]
  2. Give one advantage and one disadvantage of using a systematic sample in this context.[2]

Solution:

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Answer:(i) Random start among the first \(20\), then every \(20\)th customer. (ii) Simple and spread across the list; periodic ordering can bias the sample.

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