What do you mean by sampling method? Explain merits and demerits also.
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Definition Of Sampling(θ‿θ)(θ‿θ)
Application of certain queries to less than 100% of the population(group of all items that we are trying to observe and analyze) is known as Sampling. In simple terms, sampling is the process of selection of limited number of elements from large group of elements (population) so that, the characteristics of the samples taken is identical to that of the population. In above examples, suppose you choose 1000 students among 4 millions students. then:
4 millions students is population
1000 is the size of sample
Sampling is a great tool if you have to deal with a huge volume of data and you have limited resources. When you have large population of the data, then it can also be the only option you have.
Although you do not subject all the data to your queries, the chance that you get the desired results is almost similar to that when you do thorough checking. Provided that your choice for the sampling techniques must be appropriate