Define sampling and describe sampling procedures for water.

 Sampling is a method of studying  from a few selected items,instead of the entire big number of units. The small selection is called sample. The large number of items of units of particular characteristic is called population. Example: We check a sample of rice to see whether the rice well boiled or not. We check a small sample of solution to decide how much a given solution is concentrated. Thus with the sample we infer about a population. Some of the types of sampling are (1) simple random sampling. Mostly used for the type of population which is homogeneous.(2) Stratified sampling. Stratas help us classify the population  when the population is heterogeneous and take simple random samples from each classes.  (3) Sequential sampling is don by selection of the samples sequentially at regular intervals. The purpose of all the sampling techniques is to give the equal chance of any item to be selected without bias.

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