Statified Sampling


	Statified Sampling
	Advantages Gained in propotionso representaive of population Reduces bias in areas of contrast Flexible and useful as many geographical populations have sub-group/areas Used with either random or systematic	Disadvantages Researcher has to know initial proportions of whole population Time consuming Also added disadvantage of random and systematic
	Evaluation Sample is selected from sub-groups or layers in society/area. Sample is in proportion to their frequency.

Sample is selected from sub-groups or layers in society/area. Sample is in proportion to their frequency.

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