...ified quota sampling) 的方法,本调查研究拟以97 学年度新竹县教育处公布的新竹县国民小学为母群体 (accessible population) 。依表3-1 的分配比例抽取样本,此部分因母群名册无法确切取 得,所以样本的选取,系委讬各校主任依既定的人數配额予以选定。
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研究母群体为朔州市区的新兴阶层,采用问卷调查法,共获得有效问卷303份。
Research mother groups are Shuozhou emerging urban class, using a questionnaire survey method and a total of 303 valid questionnaires were obtained.
河曲马品种的保种与选育,应采取划定保护区,建立育种核心群,确定群体有效含量,控制近交,调整马群结构和合适的公母比例等措施;
Some technical measures were used in the breed control of Hequ horse, such matters as defining conservation region, determining effective population size and having a right foundation herd etc.
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