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" The people who comprise those samples are chosen in such a way that the results of their assessment can be generalized to an entire national population. That is, on the basis of the performance of... "
A Survey of Reading Habits: Theme 4, Literature - Page v
by Simon S. Johnson, National Assessment of Educational Progress (Project), Rexford Brown - 1973 - 261 pages
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Mathematics Technical Report: Summary Volume

National Assessment of Educational Progress (Project) - 1976 - 192 pages
...administered to probability samples of various populations. The people who comprise those samples are selected in such a way that the results of their assessment can be generalized to the entire national population. That is, on the basis of the performance of 2,500 9year-olds on a given...
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