stratified sample


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Related to stratified sample: Simple random sample, Systematic sample

strat·i·fied sam·ple

a subset of a total population, defined by some objective criterion such as age or occupation, is sampled.

stratified sample

See sample.
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Question 1: Is there a difference in school-wide student pass rates on English/Language Arts (ELA) 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)?
For the above production process a QC practitioner can take either a random or stratified sample to investigate if the process is in control.
Since age is related to increase in mental maturity as reflected in CMMS-P scores, the stratified sample across grades had to be controlled for the factor of age to obtain meaningful and reliable research results.
THE RESULTS PRESENTED HERE are based upon a nationally representative, stratified sample of adults (age 18 years and older) and representative oversam-ples of the following subgroups: public school teachers, African Americans, and Hispanics.
The survey instrument was distributed by email and fax during August and September 2010 to a random stratified sample of US-practicing psychiatrists.
Another common approach is stratified sample designs.
The survey of sponsors was conducted in 2007 with a random stratified sample drawn from 90 percent of eligible sponsors nationally.
The first term of the variance equation is the variance of a stratified sample mean under proportional allocation.
In her survey of 502 family physicians, 450 internists, and 437 medical subspecialists chosen as a random stratified sample of all those in the United States, FPs said that they devoted about 28% of their time to treating elderly patients, while internists and internal medicine subspecialists said that they spent about half of their time with seniors.
Together, they form a stratified sample that fairly represents the wide range of age, wealth, population, economic orientation and geographic location of the 27 towns that existed in Rhode Island in 1770.
From a total of 1666 worksites, a stratified sample of 500 (32%) was selected, consisting of 200 NHEHF participant worksites and 300 nonparticipant worksites.
CONTRACTOR shall administer the 2016 School Health Profiles Survey (Profiles) to a stratified sample of administrators and lead health educators in accordance with Westat (statistical research contractor) and the