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N2015 P2 Q5

N2015 P2 Q5

Junior College 2
4 marks

The manager of a busy supermarket wishes to conduct a survey of the opinions of customers of different ages about different types of cola drink.

  1. Give a reason why the manager would not be able to use stratified sampling.[1]
  2. Explain briefly how the manager could carry out a survey using quota sampling.[2]
  3. Give one reason why quota sampling would not necessarily provide a sample which is representative of the customers of the supermarket.[1]

Solution:

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Answer:(i) A possible difficulty is the absence of a complete customer sampling frame with ages. (ii) Set and fill an interview quota for each age group. (iii) Non-random selection within quotas can bias the sample.

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