The random sample selection and different sample positions ensure the samples to be representative and fair.
计算机随机选择采样点，采样点车车不同，保证了样品的代表性、公正。
Existing socioeconomic databases were used to ensure a fair population sample. Once identified, the interviewees were telephoned and asked to complete a short questionnaire with a trained interviewer.
为了确保公平性所选择的的人群样本全部使用现有的社会经济数据库，受访者打电话有专门经过培训的工作人员询问，并且在受访期间要求填写一份简短的问卷。
Existing socioeconomic databases were used to ensure a fair population sample. Once identified, the interviewees were telephoned and asked to complete a short questionnaire with a trained interviewer.
为了确保公平性所选择的的人群样本全部使用现有的社会经济数据库，受访者打电话有专门经过培训的工作人员询问，并且在受访期间要求填写一份简短的问卷。
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