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Home » Statistics Homework Help » Sampling Designs
Sampling Designs
In sampling and sample designs, data are collected for each and every unit (person household, field, shop, factory, etc. as the case may be of the population or universe which is the complete set of items which are of interest in any particular situation. For example, if the average wage of workers working in sugar industry in India is to be calculated, then wage figures would be obtained from each and every worker working in the sugar industry and by dividing the total wages which all these workers receive by the number of workers working in sugar industry.

Sampling is simply the process of learning about the population on the basis of a sample drawn from it, thus, in the sampling technique instead of every unit of the universe only a part of the universe is studied and the conclusions are drawn on that basis for the entire universe. A sample is a subset of population units. Sampling method is the only method that can be used in certain cases there are some cases in which the census method is inapplicable and the only practicable means is provided by the sample method. For example, if one is interested in testing the breaking strength of chalks manufactured in a factory under the census method all the chalks would be broken in the process of testing. Hence, census method is impracticable and resort must be had to the sample method. Similarly, if the producer wants to find out whether the tensile strength of a lot of steel wires meets the specified standard, he must resort to sample method because census would mean complete destruction of all the wires. Also if the population under investigation is infinite, sampling is the only possible solution. The sample method is often used to judge the accuracy of the information obtained from a census basis. For example, in the population census which is conducted very often (10 years in our country) the field officers employ the sample method to determine the accuracy of information method to obtain by the enumerators on the census basis.

Some of its main topics are:

1. Census and sample method
2. Merits of sampling
3. Methods of sampling
4. Quota and convenience sampling
5. Size of sample
6. Non-sampling errors
7. Sampling errors
8. Stratified sample

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