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Sampling Process

In: Business and Management

Submitted By vicky12
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THE SAMPLING PROCESS
Step 1: Define the Population
A population must be defined in terms of elements, sampling units, extent and time. IN relation to these constituent parts, the population of purchasing agent is.
(element)
purchasing agents in
(sampling unit) companies and governmental agencies that have
(extent) bought any of our products
(time) in the last three years
Step 2: Specify the Sampling Frame
If a probability sample is to be taken, a sampling frame is required. A sampling frame is a means of representing the elements of the population. A sampling frame maybe a telephone book, a city directory, an employee roster, a listing of all students attending a university, or a list of all possible phone numbers.

Maps also serve frequently as sampling frames. A sample of areas within a city may be taken and another sample of households may then be taken within each area. City blocks are sometimes sampled and all households on each sample block given instructions as to how to take “random walks” from the intersection and select the households to be interviewed.

A perfect sampling frame is one in which every element of the population is represented once but only once.
Step 3: Specify Sampling Unit
The sampling unit is the basic unit containing the elements of the population to be sampled. It may be the element itself or a unit in which the element is contained. For example, if one wanted a sample of males over 13 years of age, it might be possible to sample them directly. In this case, the sampling unit would be identical with the element. However, it might be easier to select households as the sampling unit and interview all males over 13 years of age in each household. Here the sampling unit and the population element are not the same.

The sampling unit selected is often dependent upon the sampling frame. If a relatively complete and accurate...

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