For conducting a study relating to the family size and per capita income in our country, a researcher divides the whole population of the region into different income groups and then takes random samples from each of the groups. The technique used by him for the sample collection is called:

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For conducting a study relating to the family size and per capita income in our country, a researcher divides the whole population of the region into different income groups and then takes random samples from each of the groups. The technique used by him for the sample collection is called:






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