采用分层整群抽样方法,选取1600名战士,以无记名调查问卷和向调查人员访谈的方式进行调查。
Method: Using stratified cluster sampling, we choose 1600 soldiers and investigate by questionnaires and secret talking.
采用分层整群抽样方法,选取1600名战士,以无记名调查问卷和向调查人员访谈的方式进行调查。
Method: Using stratified cluster sampling, we choose 1600 soldiers and investigate by questionnaires and secret talking.
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