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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.
The TIMSS sample is selected using a two-stage stratified sampling procedure to produce a representative sample of students from participating countries; schools are randomly sampled at the first stage and intact classrooms are sampled within each sampled school at the second stage (Joncas, 2008).
Specific methods are used to determine replacement schools in all IEA studies in order to keep this risk as low as possible: replacements are assigned in a way to ensure that they share similar features with the originally sampled school (i.e., they belong to the same stratum and have a similar size).
In the second stage, three classes in each sampled school were selected with equal probabilities during field work.
Similar(49)
Thus, for each country we listed, the level of acceptance by percentage of those sampled, school-life expectancy in average numbers of years of school, GDP per capita in U.S. dollars, religiosity in percentage of those sampled, and scientific literacy are the values provided by PISA data.
The second sampling unit contained students within 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.
These dual purposes are accomplished by administering questionnaires to participating students, their mathematics and science teachers, and the principals of the sampled schools.
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.
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