A stratified sample
of 520 students was invited to participate in the study.
Is there a difference in school-wide student pass rates on Math assessments between an experimental group of elementary, middle, and secondary RAMP-designated schools (2007-2009) and a stratified sample
of control schools at one particular point in time (2009)?
3) Estimates are from Hodges and others (1984) because the original plot selection was based on a stratified sample
with optimum allocation of effort which would cause a simple random sample analysis to be biased.
GAO analyzed a stratified sample
of FDA's 3R incentives files, 3R data provided by HHS, HHS's 3R policy and FDA's guidance, and interviewed HHS, FDA, and OPM senior officials.
The web sites that were examined were drawn from a stratified sample
of public libraries in the United States, with approximately equal numbers of libraries included from each of five different population ranges.
Use of a stratified sample
allows you to control the proportion of the sample being drawn from each apartment unit type, thereby controlling for unit-mix sampling error.
A random stratified sample
of doctors and nurses (N=150) was selected from the list of 2 200 health professionals employed at the hospital.
The NAEP is only administered to a stratified sample
Prior to adopting new materials the curriculum, Anderson told her, district leaders sent surveys to a random stratified sample
of parents, asking them how they felt about what the district was teaching students at every grade level up to that point.
A probabilistic stratified sample
of public and private schools (71) was selected from the eleven health administrative regions of Puerto Rico, according to the type of school and economic status.
All data were pooled in a stratified sample
to estimate overall total coverage in the PPHC area.
District Example: A district may want to consider surveying every school administrator in the district, select a stratified sample
of teachers to survey, survey all district administrators, and conduct site visitations in every school that serves students.