Probability Sampling: Stratified Random Sample
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Questions and Answers

What method of sampling is used when obtaining a list of all seventh graders and collecting data from a subset of schools?

  • Quota sampling
  • Convenient sampling
  • Cluster sampling (correct)
  • Stratified random sampling

    • What is an advantage of cluster sampling over other methods for obtaining information?

  • Guarantees representation of all population elements
  • Provides a high degree of generalizability
  • Eliminates the need for an expert to balance cluster selection
  • Cost-effectiveness for selecting subjects based on proximity (correct)

    • In cluster sampling, what is a disadvantage related to selecting between many small clusters or few large clusters?

  • Increased representativeness at a higher cost
  • Economic efficiency with low variability control (correct)
  • Lack of consideration for proximity in selecting clusters
  • High variability control with lower economic efficiency

    • What type of sampling involves selecting subjects based on convenient accessibility and proximity to the researcher?

    <p>Convenient sampling</p> Signup and view all the answers

    What is a disadvantage of using convenient sampling as a method of data collection?

    <p>Unrepresentative sample</p> Signup and view all the answers

    Which type of sampling ensures some degree of representativeness by selecting people according to certain fixed quotas?

    <p>Quota sampling</p> Signup and view all the answers

    What is the main advantage of using a stratified random sample over a simple random sample?

    <p>All of the above</p> Signup and view all the answers

    What is the main disadvantage of using a stratified random sample?

    <p>All of the above</p> Signup and view all the answers

    In a stratified random sample, how are the population elements separated into groups?

    <p>Into non-overlapping groups (strata)</p> Signup and view all the answers

    Which of the following is a type of probability sampling method?

    <p>All of the above</p> Signup and view all the answers

    What is the key characteristic of a systematic random sample?

    <p>The sample is selected according to a random starting point but with a fixed, periodic interval (k)</p> Signup and view all the answers

    Which of the following is a potential disadvantage of a systematic random sample?

    <p>All of the above</p> Signup and view all the answers

    What is a stratified random sample?

    <p>A sample in which each sampling unit is a collection of elements</p> Signup and view all the answers

    Why may stratified random sampling produce a smaller bound on the error of estimation compared to simple random sampling (SRS)?

    <p>Because measurements within strata are homogeneous</p> Signup and view all the answers

    What is one disadvantage of stratified random sampling compared to simple random sampling (SRS)?

    <p>It requires greater effort and complexity</p> Signup and view all the answers

    What is a clustered random sample?

    <p>A sample where each cluster is a collection of elements</p> Signup and view all the answers

    How are clusters selected in a clustered random sample?

    <p>By listing all clusters and forming a frame</p> Signup and view all the answers

    What can be an example of a cluster in clustered random sampling?

    <p>Zip codes</p> Signup and view all the answers

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