RA Q134
- A
After dividing the population into different groups on the basis of a specific standard and then taking an equal proportion of units from each group
- B
After dissociating the population in different groups on the basis of specific standards and then the units are selected from these groups.
- C
After dividing the population into different 'strata' and then selecting any one strata out of them
- D
None of the above
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