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NAEP Technical DocumentationStudent Sample Selection for the 2005 National Twelfth-Grade Assessment

The student sample consisted of all twelfth-grade students in the school if the school had 144 or fewer students, or a sample of 135 students selected without replacement, if the schools had 145 or more students.

The assessments were partitioned into three basic spirals: reading, mathematics, and science operational students ("the operational session"); science bridge; and the pilot studies. The overall probability of being assigned to an operational session was 28 in 45 (62.2 percent); the probability of being assigned to a science bridge session was 2 in 9 (22.2 percent); and the probability of being assigned to a pilot session was 7 in 45 (15.6 percent). The student sampling process was designed so each student would have exactly these probabilities of being assigned to each of the three sessions.

An extra condition was imposed that no fewer than 12 students be assigned to a science bridge session in any one school, if any were assigned at all. In other words, either 12 or more students were to be sampled, or none. This was due to the added difficulties of administering the science bridge session.

The process of list submission, sampling students from year-round schools, sampling new enrollees, and determining student eligibility and exclusion status was the same as the process used for the NAEP State student sample.

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