Which sampling method selects groups such as schools or villages first and then studies the units within the selected groups?
Correct answer: A. Cluster sampling
- A. Cluster sampling
- B. Quota sampling
- C. Stratified sampling
- D. Convenience sampling
Explanation
Cluster sampling divides the population into natural groups and selects groups for study. Stratified sampling selects units from each defined subgroup, so it is not the same as selecting whole groups first.
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Data collection covers primary and secondary sources, qualitative and quantitative data, discrete and continuous variables, sampling methods and questionnaire design. Presentation includes frequency tables, grouped data, bar charts, histograms, pie charts, line graphs and cumulative frequency curves, with care over class intervals and misleading scales.
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