Case Study

Using the concepts of sample size and analytical focus, explain how Dr. Alvarez's and Dr. Stein's proposals represent different quantitative methodologies.

Case context: A research team plans to evaluate a new reading intervention for children with dyslexia. Dr. Alvarez suggests tracking the weekly reading speed of 66 individual children in detail over several weeks. Dr. Stein suggests administering the intervention to a class of 100100 children and comparing their average pre-test and post-test scores.

Question: Using the concepts of sample size and analytical focus, explain how Dr. Alvarez's and Dr. Stein's proposals represent different quantitative methodologies.

Sample answer: Dr. Alvarez's proposal represents single-subject research because it involves a small sample size (specifically 66 children, which falls within the typical range of 22 to 1010) and focuses on the detailed experimental analysis of individual behavior. Dr. Stein's proposal represents group research because it involves a large sample size (100100 children) and focuses on analyzing their behavior using aggregated metrics, specifically the average (mean) scores of the group.

Key points:

  • Dr. Alvarez's proposal represents single-subject research.
  • Dr. Alvarez's study uses a small sample size (66 children, which is within the typical 22 to 1010 range) and focuses on detailed experimental analysis.
  • Dr. Stein's proposal represents group research.
  • Dr. Stein's study uses a large sample size (100100 children) and focuses on aggregated metrics (group averages/means).

Rubric: The answer must correctly associate Dr. Alvarez's proposal with single-subject research and Dr. Stein's proposal with group research. It must explain that Dr. Alvarez's study has a small sample size (66 children) and focuses on detailed experimental analysis of individuals, while Dr. Stein's study has a large sample size (100100 children) and focuses on aggregated metrics like group means.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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