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SAMPLE SIZE (Choosing the right size for a sample (The margin of error…

- - - - Calculate a sample size that is representative of the population.
        
        Select the sample elements (cases) so that at the beginning everyone has the same possibility of being chosen.
- - - - Pilot study
      - Comparative study
      - Approach based on the interval
- - - - σ is the standard deviation of the population.
      - n is the sample size.
      - z is the standard normal value corresponding to the desired confidence level.
      - E is the maximum permissible error.