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    Question

    Which sampling method is used when the population is

    divided into homogeneous groups (strata), and a random sample is taken from each group?
    A Systematic Sampling Correct Answer Incorrect Answer
    B Stratified Random Sampling Correct Answer Incorrect Answer
    C Cluster Sampling Correct Answer Incorrect Answer
    D Convenience Sampling Correct Answer Incorrect Answer
    E Quota Sampling Correct Answer Incorrect Answer

    Solution

      • Stratified Random Sampling:  The population is first divided into distinct, non-overlapping subgroups called  strata  that are homogeneous internally (e.g., strata based on income level, region, profession). Then, a simple random sample is drawn  from each stratum . This ensures representation from all important subgroups.
      • Contrast:   Cluster Sampling  divides the population into heterogeneous clusters (e.g., city blocks), and a random sample of clusters is chosen, with all members in chosen clusters surveyed.  Systematic Sampling  picks every k-th member from a list.  Convenience Sampling  is non-random and based on ease of access.

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