Consumer trust and traceability focus groups and survey

Using a purposive sampling method at four locations across the UK, participants were invited by a marketing company to attend one of eight scheduled focus groups sessions...本研究在英国境内四个地点采用立意抽样法（purposive sampling），由某市场调研公司邀请参与者参与八场预先排定的焦点小组座谈会中的一场……