Sampling Methods

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A set or group of all units or items under study is called a Population. For example, if we want to study the IQ level of all XII standard students of Gujarat Board, then all XII standard students of

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A set or group of units selected from a population on the basis of some definite criteria is called a Sample. For example, if we select 1000 students from all XII standard students of Gujarat board ba

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Sample with replacement: Each unit is selected from the population after replacing the unit selected earlier in the population. Sample without replacement: Each unit is selected from the population wi

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The inquiry in which information is collected from each and every unit of the population is called population inquiry or census survey. Example: The census survey conducted every ten years in India, o

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The inquiry in which information is collected from a few units selected from the population is called sample inquiry or sample survey. Example: Collecting information about spending habits of few sele

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The procedure of selecting a sample from a population is called sampling. It is used to draw inferences about the characteristics of the population based on sample data.

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1. The number of units in population is very large 2. Units are spread over wide geographical area 3. Units under inquiry are to be destroyed (destructive testing) 4. Limited availability of resources

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Sample Statistics: Measures such as mean, standard deviation, etc. calculated from numerical data obtained from sample units. Parameters: All these measures calculated for population data. The main ob