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NAEP Sample Design → NAEP 2005 Sample Design → National Assessment Sample Design → Fourth- and Eighth-Grade Public School Science Assessment and Bridge Study → School and Student Participation in the 2005 National Science Assessment → School Response Rates for Science Bridge

NAEP Technical DocumentationSchool Response Rates for Science Bridge and Pilot Studies

The table below shows counts of respondents and nonrespondents before and after substitution for fourth and eighth grade science bridge and pilot studies. For both fourth and eighth grade, only two cooperating substitute schools replaced originally nonresponding schools.

The tables include unweighted counts and percentages, and weighted counts and percentages using the school base weight times the estimated grade enrollment. In all cases, the response rates were very high for a voluntary survey.

Distribution of nonresponding and responding sampled schools, science bridge and pilot study, by grade: 2005

Science bridge and pilot studies	Before substitution			After substitution
	School count	Unweighted percent	Enrollment- weighted percent	School count	Unweighted percent	Enrollment- weighted percent
Fourth grade
All eligible sampled schools	550	100	100.00	550	100.00	100.00
Not  responding	10	2.39	5.86	10	2.02	4.48
Responding	530	97.61	98.14	530	97.98	98.52
Eighth grade
All eligible sampled schools	640	100	100.00	640	100.00	100.00
Not responding	10	2.20	2.03	10	1.89	1.55
Responding	620	97.80	97.07	620	98.11	98.45
NOTE: Numbers have been rounded. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2005.

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