We randomly selected 806 children under 6 years of age from 45 primary anganwadi (childcare) centres in Chandigarh, Punjab, India, that were chosen through multistage stratified random sampling.
在印度旁遮普省昌迪加尔的45所托儿所(anganwadi)中心采用多级分层随机取样法选择了806名6岁以下儿童。
Scientists believe the existence of this age-old reward mechanism indicates there is an evolutionary advantage in sampling the unknown.
科学家认为，脑部这种古老的奖励机制在尝试未知事物方面有进化优势。
Methods Questionnaire survey was conducted among 1298 residents sampled by randomly stratified sampling. The age of the residents ranged from 15 to 69 years old.
方法用分层随机抽样的方法抽取1298名15 ~ 69岁的农村居民进行问卷调查。
Methods Stratified sampling methods were used to carry out the prevalence study of maternity and child care for women at child bearing-age in Luochuan County and Bin County.
方法采用分层抽样，抽取洛川、彬县育龄妇女入户进行妇幼保健现状问卷调查。
To undertake a systematic random sampling, one needs to know the total number of households, the average number of children under 5 years of age in a household, and the total population.
要进行一次系统随机抽样，必需知道人群中的家庭总数，平均每户家庭5岁以下儿童的个数，以及总人口。
METHODS: A total of 478 children at age of 9-12 years from Tulufan City and Buerjin County of Xinjiang Province were enrolled by random cluster sampling.
方法：分别在新疆吐鲁番市区和布尔津县两地采用随机整群抽样的方法，抽取9~12岁儿童478名。
Methods In a method of randomly chester sampling, we drew 337 mothers whose infant age varying in month from 0 to 18 and conducted a questionnaire investigation.
方法采用整群随机抽样方法，抽取337例0～18个月婴幼儿的母亲，对其进行问卷调查。
Methods In a method of randomly chester sampling, we drew 337 mothers whose infant age varying in month from 0 to 18 and conducted a questionnaire investigation.
方法采用整群随机抽样方法，抽取337例0～18个月婴幼儿的母亲，对其进行问卷调查。
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