Give the description about probability sampling method

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Probability sampling provides a scientific technique of drawing samples from the population according to some laws of chance, in which each unit in the universe has some definite pre-assigned probability of being selected in the sample.

Different types of sampling are in which:

(i) Each sample unit has an equal chance of being selected.

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(ii) Sampling units have varying probability of being selected.

(iii) Probability of selection of a unit is proportional to the sample size.

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