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NAEP Assessment Sample Design → NAEP 2015 Sample Design → Sample Design for the 2015 National Assessment → 2015 Twelfth-Grade Public School National Assessment → Sampling Frame for the 2015 Twelfth-Grade Public School National Assessment → New-School Sampling Frame for the 2015 Twelfth-Grade Public School National Assessment

To achieve as close to full coverage as possible, the CCD-based school sampling frame was supplemented by a sample of new schools obtained from a sample of districts. Each sampled district was sent a list of the CCD schools and asked to add in any new schools or old schools that had become newly eligible for grades 4, 8, or 12. 

 

Since asking every school district to list new and newly-eligible schools would have generated too much of a burden, a sample of districts was contacted to obtain a list of new schools. To represent the unsampled districts in the full sample of schools, weights for schools included in the new-school sample were adjusted to reflect the district selection probability. This was done for fourth-, eighth-, and twelfth-grade schools in one step. (See the new-school frame building page in the corresponding state assessment sample design section.)

 

The following table presents the number of schools and estimated enrollment for the twelfth-grade new school frame by census region.