In order to obtain a biased stratified sample
, we simulated a two-phase random selection process from the population (Figure 1(a)) such that P(Y = 1 | S) = 0.5 and P([X.sub.e] = 1 | S) = 0.5.
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) and a stratified sample
of control schools over time (from 2005-2006 to 2008-2009)?
On the basis of GAO's review of a stratified sample
of FDA's 3R incentive files awarded from January 2007 through October 2008, GAO found that FDA maintained documentation which provided sufficient explanation to justify each award.
Due to these issues, sample size in terms of number of clusters and items selected from each cluster should be greater than the sample size required for a simple random sample or 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.
does each random stratified sample
meet the requirement to be a SRS.
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.
Interestingly, the results of a questionnaire on linguistic attitudes and cultural identities distributed to a stratified sample
of 1,440 individuals point to a new positive attitude towards CF, particularly among younger speakers.
In a national survey of a stratified sample
of 1,278 high school students from 14 schools across the country, only 3.7% of the students in consulted their teachers about career planning, although many more consulted their fathers (23%) and mothers (32%).