The phrase "sample of schools" is correct and can be used in written English.
It refers to a subset or selection of schools for analysis or study. Example: The researchers collected a random sample of schools from different regions to gather data on the effectiveness of their teaching methods.
In countries with obligatory schooling, representative samples of children of school age can be obtained by selecting all, or a random sample, of the pupils of a representative sample of schools (a cluster-sampling method).
Interviewers visited a nationally representative sample of schools in 2000, 2006 and 2014.
The E.P.A. tested for radon in a sample of schools nationwide between 1990 and 1991.
The survey, which I coordinated, was undertaken in a representative sample of schools, and nearly 1,000 children completed online questionnaires, adapted to their cognitive levels.
The bigger sample of schools will be analyzed to propose changes in the calculation procedure after the end of the whole study.
A 2008 Ofsted report that looked at a sample of schools providing opportunities to learn outside the classroom found that, when implemented well, those opportunities "contributed significantly to raising standards and improving pupils' personal, social and emotional development".
The national tests she cites are not the measure of federal accountability, are given only to a small sample of schools, and are not aligned with New York State standards and therefore with what we teach in our classrooms.
Future studies should use a more representative sample of schools selected from a variety of geographic regions across the region.
Ong added that the biased sample of schools in favor of high-performing schools can also be seen in Pisa 2015's own data on Malaysia.
Only those schools categorized by The Carnegie Foundation as doctorate-granting universities, master's colleges and universities or baccalaureate colleges are included in this sample of schools.
The most popular higher education destinations for international school students are the U.S., U.K. and Canada, according to ISC Research based on a sample of schools.
