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A clinical psychologist wants to estimate the percentage of adults in a city who currently meet the criteria for major depressive disorder. Identify whether this study uses a non-experimental or experimental survey design, and justify your classification based on the study's objective.

Question: A clinical psychologist wants to estimate the percentage of adults in a city who currently meet the criteria for major depressive disorder. Identify whether this study uses a non-experimental or experimental survey design, and justify your classification based on the study's objective.

Sample answer: This study uses a non-experimental survey design. The objective is to describe a single variable (the prevalence of major depressive disorder) in a population without manipulating any variables or testing causal relationships.

Key points:

  • Identify the design as non-experimental.
  • Explain that the objective is to describe a single variable.
  • Mention that estimating prevalence of a disorder is a descriptive, non-experimental application of surveys.

Feedback: Correct answers must identify the design as non-experimental and justify it by stating the goal is to describe a single variable (prevalence of a mental disorder) rather than manipulating variables or testing causal hypotheses.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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