3.4 Planning sampling
Survey sampling means not surveyed the entire unit, the elements of the overall investigation, only on some units to save time, effort and cost . The most important issue is to ensure that the sample must be able to represent the whole joint. Project author used the questionnaire to direct opinions of 390 consumers in different areas, inside and outside the city, in supermarkets and the pickup point of the bus routes Big C. The author himself is the direct subject and only investigated but have difficult than hiring the vote but ensure objectivity to results compiled by the contents of the questionnaire are the author specific interpretation, precisely in the case of respondents still feel unfamiliar with is the question or answer options (for closed questions), avoid the imposition, personal prejudices of people are renting the vote .
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