**What is Sampling?**

**Sampling is the formation of a subset of population i.e. to form a group by taking a finite number of members within a population. E.g. if we consider all the students of a school as population then a 50 students from that school will form a sample.**

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**Why is Sampling Necessary?**

**Sampling is done to infer about the population. After a sampling is done then the estimation of population parameter is done from the sample statistic. Also a researcher does a testing of hypothesis with the sample statistic against a null hypothesis to decide whether to accept it or reject it. We will read about these functions in the later sections. However, the main reason why a sampling is done is when a population is too large then a sampling is done because it is nearly impossible to collect such a large volume of data. Also, the money and time that is involved in working with a population encourages the sampling method because it has been proved that if a sampling is done using the right technique then it can be very effective in inferring about the population characteristics.**