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1. METHOD Using stratified random sampling method.

2. DESIGN: Clustering stratified random sampling, cross- sectional survey.

3. DESIGN: A clusting stratified random sampling survey.

4. Methods A questionnaire survey was conducted stratified random sampling among 1689 people in 2 counties.

5. Methods With a method of stratified random sampling, a questionnaire survey was conducted among 786 students from 8 middle schools in Beijing.

6. Methods A stratified random sampling was conducted among inhabitants with questionnaire and partial health examination in Yunlong district, Xuzhou.

7. This study is based on a stratified random sampling sur-vey on passengers traveling by Taipei Metro.

8. Though stratified random sampling method is adopted for the arterial and collector functional systems, there is a good potential to improve it.

9. The fourth part is an investigation on the state-of-art of the information-literacy education in the Higher Teacher Education Institutions in Chongqing by adopting stratified random sampling.

10. Methods A total of 310 teachers from 4 middle schools in Huaibei City were selected with stratified random sampling to undergo a survey with teacher job burnout questionnaire(MBI-ES).

11. Methods: The self-designed questionnaires were used to anonymously investigate on 179 students in 19 academies of the university who were selected by stratified random sampling.

12. The authors take the students of Gansu Lianhe University as objects of study, using stratified random sampling method taking samples of 1000.

13. In each year of the study, 500–600 health facilities providing the BPHS were selected by stratified random sampling in 29 provinces of Afghanistan.

14. 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.

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15. Methods: The number of samples was calculated with the optimum allocation stratified random sampling survey.

16. Methods:Totally 1000 nurses were investigated with a self designed questionnaire using stratified random sampling.

17. Method Some food processing employees were selected according to stratified random sampling method, and filled in a unified questionnaire anonymously.

18. Methods General investigation was adopted to understand the water supply situation in rural areas and stratified random sampling was used to monitor the water quality.

19. Methods 3034 children between 0 to 6 years in three Gorges reservoir were selected by stratified random sampling method.

20. The paper proposes new separate ratio estimators for population mean using known skewness coefficient of auxiliary variable in stratified random sampling.