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Case Study

Based on the concept of convenience sampling, explain why Dr. Aris's sampling method is a form of non-probability sampling, and describe how this choice of method impacts Dr. Aris's ability to draw conclusions about college students in general.

Case context: Dr. Aris is conducting a study on sleep hygiene and academic stress. Due to a tight timeline and zero budget, Dr. Aris recruits 80 participants by setting up a table in the lobby of the psychology department building and asking passing students if they would like to complete a quick survey.

Question: Based on the concept of convenience sampling, explain why Dr. Aris's sampling method is a form of non-probability sampling, and describe how this choice of method impacts Dr. Aris's ability to draw conclusions about college students in general.

Sample answer: Dr. Aris is using convenience sampling because the participants are selected based on being physically nearby in the psychology lobby and readily willing to volunteer. This is a non-probability sampling method because participants are not selected at random, and not all college students have an equal chance of being chosen. Because the sample consists only of psychology department visitors who volunteered, they may not represent the broader college student population. Consequently, Dr. Aris cannot reliably generalize the findings of the study to all college students.

Key points:

  • Explains that the method is convenience sampling because it relies on nearby and willing individuals.
  • Explains that non-probability sampling means not everyone has a random or known chance of selection.
  • Identifies that the sample may not represent the broader population of college students.
  • Concludes that Dr. Aris's ability to generalize the findings to all college students is severely limited.

Rubric: The response must demonstrate comprehension by explaining why the lobby setup represents convenience sampling (non-random, nearby, willing volunteers) and explaining the limitation on drawing general conclusions (lack of representativeness, unable to generalize to the broader student population).

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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