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Case Study

Diagnose the specific raw data issues represented by these three anomalous surveys, and explain why identifying these issues at this stage is crucial for the instructor's subsequent statistical analysis.

Case context: A psychology instructor collects paper surveys from a class of undergraduate students measuring their satisfaction with a new textbook on a scale of 11 to 1010. While entering the data, the instructor notices that one survey contains a smudged rating that cannot be read, another survey has the satisfaction question left blank, and a third survey contains a rating of 1515.

Question: Diagnose the specific raw data issues represented by these three anomalous surveys, and explain why identifying these issues at this stage is crucial for the instructor's subsequent statistical analysis.

Sample answer: The smudged rating represents an illegible response, the blank satisfaction question represents a missing response, and the rating of 1515 on a 11-to-1010 scale represents an obvious misunderstanding or suspicious entry. Identifying these issues early is crucial because it allows the instructor to determine if each participant's data is usable for statistical analysis, preventing inaccurate or incomplete data from biasing the results.

Key points:

  • Diagnose the smudged rating as an illegible response.
  • Diagnose the blank question as a missing response.
  • Diagnose the satisfaction rating of 1515 as an obvious misunderstanding or suspicious entry.
  • Explain that early identification is crucial for determining if the participant's data is usable for statistical analysis.

Rubric: The student must correctly diagnose the three anomalies (smudged = illegible; blank = missing; 1515 on 11-to-1010 scale = misunderstanding/suspicious entry) and explain that checking raw data is crucial to determine if the data is usable for statistical analysis.

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Updated 2026-05-26

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KPU

Research Methods in Psychology - 4th American Edition @ KPU

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