A. Population is scattered and large size from which the sample is to be drawn
B. The population is heterogeneous?
C. A long survey is needed
D. (a) and (c) both
✅ The correct answer is option D.
Area (cluster) sampling technique is used whenpopulation is scattered and large size from which the sample is to be drawn and a long survey is needed.
Area (cluster) sampling technique is used whenpopulation is scattered and large size from which the sample is to be drawn and a long survey is needed.