Two teaching experiments were conducted and a big-sample questionnaire was carried out to test its efficiency.
在实践中进行了两次教学实验，同时进行了大样本的问卷调查，检验其效度。
METHODS: Random sample questionnaire survey was conducted among consumers in Baoding city and its surrounding counties, and the data were subjected tot-test, analysis of variance, and LSD-t test.
方法：对保定市及周边县城消费者进行随机抽样问卷调查，采用t检验、方差分析和LSD - t检验等方法对调查数据进行统计学处理。
Scientists measured blood levels of the vitamin in a representative sample of 1, 766 people over 65 and assessed their mental functioning with a widely used questionnaire.
科学家通过广泛使用的调查问卷方式，测量了具有代表性的年龄超过65岁的1766个人血液中的维生素d的含量。
应用推荐