Which sampling method divides a population into subgroups and then selects units from each subgroup?
Correct answer: B. Stratified sampling
- A. Cluster sampling
- B. Stratified sampling
- C. Convenience sampling
- D. Systematic sampling
Explanation
Stratified sampling divides the population into relevant subgroups called strata and samples from each one. Cluster sampling usually selects entire groups or clusters rather than sampling individuals from every subgroup.
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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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