用group sampling造句子，“group sampling”造句

Methods: Adopting the methods of whole group sampling at random, study on 306 children aged 4-6 of 14 kindergartens in Jing an District of Shanghai.

Adopts the group sampling law to choose 434 example physical exam rural women to carry on the questionnaire survey, carries on statistics analysis.

Methods: Using the group sampling method, the investigation on the Nangtong nursing human resources for the Engaging System Nurses at Secon.