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Simple random sampling was used to select one class from each group of grades.
For the time limitation, the two urban schools agreed to select one class from each grade (grade 2-6) to be investigated.
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From each school, we selected one class (if there was more than one) in grade 5.
We selected one class per school for inclusion in the formative research resulting in four classes overall.
Within each school, the field teams randomly selected one class per grade for the survey, in grades covering students aged 11 years and above.
We randomly selected one school from each township in the sample, and within each school we randomly selected one class in each of the fourth and fifth grades (likely age range 9-12 years).
Finally, within each selected school, one class from each grade was randomly selected, where all students in the selected class were invited to participate.
I took my new book, my selected poems, One Class, out for a walk.
From each participating school, 6 classes were randomly selected with one class from each form (Form 1 to Form 6) to obtain a proportional number of subjects aged 11 18 years of age.
The subsample of children required for the cohort study was selected from one class from grades 6 and 7 combined in each school, resulting in 784 students of the cohort study.
In selected schools, one class was randomly selected from each grade (except for the first and 12th grades).
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