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the selection of part of a total population of consumers or products whose behaviour or performance can be analysed, in order to make inferences about the behaviour or performance of the total population, without the difficulty and expense of undertaking a complete census of the whole population.

Samples may be chosen randomly, with every consumer or product in the population having an equal chance of being included. Random samples are most commonly used by firms in QUALITY CONTROL where they are used as a basis for selecting products, components or materials for quality testing.

Alternatively, samples may be chosen by dividing up the total population into a number of distinct sub-groups or strata, then selecting a proportionate number of consumers or products from each sub-group since this is quicker and cheaper than random sampling. In MARKETING RESEARCH and opinion polling, quota sampling is usually employed where interviewers select the particular consumers to be interviewed, choosing the numbers of these consumers in proportion to their occurrence in the total population.

Samples may be:

  1. cross-sectional, where sample observations are collected at a particular point in time, for example data on company sales and the incomes of consumers in the current year, embracing a wide range of different income groups, as a basis for investigating the relationship between sales and income;
  2. longitudinal, where sample observations are collected over a number of time periods, for example data on changes in company sales over a number of years and changes in consumer incomes over the same time periods, as a basis for investigating the relationship between sales and income. See STATISTICAL INFERENCES, QUESTIONNAIRE.
Collins Dictionary of Business, 3rd ed. © 2002, 2005 C Pass, B Lowes, A Pendleton, L Chadwick, D O’Reilly and M Afferson
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High resolution TEM performed on particles that had been suspended in ethanol (95% volume fraction) for 2 d showed packed crystalline HA particles 5 nm to 10 nm in size (Fig.
Since its inception in 1975, Naolorac has sold high resolution superconductive magnets and NMR imaging spectrometers.
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It is also capable of high resolution that matches the ever higher write density of the HDDs.
Hardware: MacIIxi design workstation with 8 megabytes of RAM, 100-300 megabyte internal hard drive, laser printer, full-color, high-resolution, refrigerator-sized double-page display monitor, accelerator board, network hardware including a file server to link your department with other workstations and client groups, cd-room drive, mass magnetic media storage system, 9600 baud modem, color scanner, color printer and maybe even a super high resolution output device such as a Linotronic L-300.
[ClickPress, Mon Feb 25 2019] Market Research Reports Search Engine (MRRSE) has recently updated its massive report catalog by adding a fresh study titled " High Resolution Dispensing Systems and Equipment Market Scenario Focusing on Improvements Shaping Industry Growth ".
The high resolution 7″ calibrated monitor boasts 1500 nit brightness making it perfect for hood-free outdoor monitoring.
This non-contact, three-dimensional surface measurement system is said to feature fast, non-destructive measurements, point and shoot operation, high resolution, accuracy and repeatability on smooth or rough surfaces, and is said to be highly affordable.
For more than 20 years, Extron Electronics has been a leading manufacturer of professional AN system products including computer-video interfaces, switchers, matrix switchers, distribution amplifiers, video scalers, speakers, signal processing devices, Ethernet control interfaces, and high resolution cables.

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