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The second sampling unit contained students within the sampled schools.
These dual purposes are accomplished by administering questionnaires to participating students, their mathematics and science teachers, and the principals of the sampled schools.
Replacing sampled schools that refuse to participate with predefined (replacement) schools is a common strategy to support countries facing school participation problems.
As a standard rule, 85% of the sampled schools within a country as well as 85% of the sampled individuals must participate in the survey in order to accept the data and results for a final release.
However, since information on the originally sampled schools is very limited, one cannot be certain that there are no systematic differences between the sampled and their replacement schools that could cause nonresponse on one side but not on the other.
Of the sampled schools, 89% participated in the survey.
Similar(24)
Mr. Gore's speeches were repeatedly interrupted by intercom announcements from the principal's office, and the vice president sampled school cafeteria cuisine, downing two cheeseburgers and some french fries.
As the TIMSS sample design allowed sampling one class in each sampled school, data that were obtained on the class level also represented the school level.
Depending on the average class size in the country, one class from each sampled school may be sufficient to achieve the desired student sample size.
Boys had higher prevalence of FNA among our sampled school-aged children.
In the second stage, three classes in each sampled school were selected with equal probabilities during field work.
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