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Method1. SampleThe sample of 14 schools are comprehensive and non-academically-selective. Eight schools are single-sex and six are co-educational schools. Four schools cater for Grades 7-10 and ten schools cater for Grades 7-12. In terms of the size of schools, in 2010, the Grade 10 cohorts ranged in size from 108 to 218 with the number of practicing Grade 10 science teachers ranging from 4 to 8 per school.
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