Cluster sampling is divided the population into clusters (developing countries, emerging economies and developed countries) and then take samples from each cluster, which is the suitable way of sample for this study. Please visit http://www.journalfirst.org/procedures for more information!
This research is doing the iPhone’s investigation in Chinese and British market and the research target group is the current users and the people who do not own iPhone yet. For each cluster, I would choose 100people to do the questionnaires in the countries.
 

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