NAEP Assessment Sample Design → NAEP 2009 Sample Design → Sample Design for the 2009 National Assessment → Hands-On Tasks (HOT) and Interactive Computer Tests (ICT) for the 2009 Science Assessment → Public School 2009 Science HOT and ICT Assessments → Student Sample Selection for the Public School 2009 Science HOT and ICT Assessments

NAEP Technical DocumentationStudent Sample Selection for the Public School 2009 Science HOT and ICT Assessments

For the hands-on tasks (HOT) and interactive computer tests (ICT) assessments, the target student sample sizes within sampled schools varied by grade. All fourth-grade students in the school were sampled if the school had 54 or fewer students in that grade. For schools with more than 54 fourth-grade students, a sample of 54 students was selected without replacement. For eighth and twelfth grades, all students were sampled if the school had 52 or fewer students in that grade. Otherwise, a sample of 52 students was selected without replacement.

In schools selected for both HOT/ICT and the operational assessments in math, reading, and science, since the primary sample consisted of students selected for the operational tests, the HOT and ICT student samples were selected from any students remaining on the student roster after removing the students selected to do the operational assessments.

Three types of assessment sessions were conducted in the schools selected for the HOT/ICT samples: science hands-on tasks (HOT), science interactive computer testing (ICT), and a pilot. Student sampling for the NAEP 2009 national science probe samples was designed to achieve proportions shown in the table below for each study type (HOT, ICT, and pilot), which would provide the targets needed for each assessment overall.

The table also presents the target sample sizes for students in schools for each study type and grade. As specified above, all grade-eligible students in schools were taken if the school's grade-eligible student count was less than or equal to the target value, and samples equal to the target were taken for schools with grade-eligible student counts greater than the target value.

Proportions for school session assignments and target sample sizes for science hands-on tasks (HOT), interactive computer tests (ICT), and pilot studies, by grade: 2009

Grade	Proportions			Target sample size
	Hands-on tasks (HOT)	Interactive computer tests (ICT)	Pilot
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Science Assessment.
4	0.1379	0.1379	0.7241	54
8	0.1429	0.1429	0.7143	52
12	0.2857	0.2857	0.4286	52

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 2009 state student samples.

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