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Marketing Research-----Sampling (Sample Design, advantages (Doesn't…

- - - - Easier to extract the sample than via simple random
        
        Ensures sample is spread across the population
- - - - Need a complete and accurate population listing
      - May not be practical if the sample requires lots of small visits over the country
- - - - Samples often small
      - Cannot extrapolate from sample
      - very prone to bias
- - - - Not random,so some risk of bias
        
        Need to underestand the population to be able to identify the bias of stratification