stratified random sampling surveys 分层随机抽样调查
His team conducts random surveys constantly.
他的团队不断地进行随机调查。
Although random sampling used for many surveys fails to cover large segments of the population, the procedure nonetheless offers insight into voting and consumption patterns.
虽然许多调查所用的随机取样不能覆盖大部分人口，但是这一过程使人们能更深刻地理解选举和消费的模式。
Instead, use that communications team to conduct some surveys, or make some random phone calls yourself to employees or first-line managers.
相反，应该利用交流团队来执行一些调查，或者自己对员工或一线管理人员执行一些随机的电话调查。
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