The phrase "a representative sample of each" is correct and usable in written English.
It can be used when discussing the selection of a subset from a larger group that accurately reflects the characteristics of that group.
Example: "In our research, we collected a representative sample of each demographic to ensure our findings were valid."
Alternatives: "an indicative sample of each" or "a typical sample of each".
Mr. Mocarsky said Arbitron seeks a representative sample of each local market, with specific benchmarks for ethnic groups, genders and ages.
A representative sample of each of the formal teaching session types was mapped, and residents anonymously completed a 5-question written survey rating the session.
Direct interviews were conducted in which an intended survey, designed specifically for each stakeholder, was answered by a representative sample of each one.
With only 700 people included, the study is not a representative sample of each country and reflects only a snapshot of cultural attitudes in the area studied.
A representative sample of each age group was injected (IP) daily with a single dose of either DHET (1 mg/kg) or vehicle (0.9% saline) solution for one month.
If one could talk to a representative sample of each of those companies' employees, it's equally likely that, say, Nestlé Purina PetCare would have come out on top.
Single 24-h dietary-recall data were also collected from a representative sample of 8% of each EPIC center.
In brief, in order to get a representative sample of people in each age group a two stage sampling strategy was used.
The preferred approach would be to collect a representative sample of observations for each price required for the study, specific to each country, but this is often not feasible or affordable.
His group had tried to assure that a representative sample of students in each country took last year's test, he said.
The latest Timss study, the world's largest review of math and science achievement, involved testing a representative sample of students in each country in 2007, the first time the tests had been administered since 2003.
