Question: what are the different methods of collecting data and sampling techniques?
Answer: Simple random sampling. In this case each individual is chosen entirely by chance and each member of the population has an equal chance, or probability, of being selected. ... 
Systematic sampling. ... 
Stratified sampling. ... 
Clustered sampling. ... 
Convenience sampling. ... 
Quota sampling. ... 
Judgement (or Purposive) Sampling. ... 
Snowball sampling.