This core textbook introduces psychology students to research methods. The author’s principal goal is to present methods in a way that will lend coherence to the material. He does this by providing a meaningful framework based around Campbell and Stanley’s "threats to validity" and by organizing the book around the phases of the research process. In addition, in his approach and via boxed features, the author encourages and models a process of critical thinking for students.

Arranging the Comparisons I: An Introduction to Research Design

Arranging the comparisons I: An introduction to research design
  • A Quick Guide to Chapter 5: An Introduction to Research Design
  • Introduction to the Chapter
  • Threats to Internal Validity
    • Extraneous Events (a.k.a. History)
    • Temporal Effects (a.k.a. Maturation)
    • Group Composition Effects (a.k.a. Selection)
    • Interaction of Temporal and Group Composition Effects (a.k.a. Maturation x Selection Interaction)
    • Selective Sample Attrition (a.k.a. Mortality)
    • Statistical Regression Effects (a.k.a. Regression to the Mean)
    • Summing Up Internal Validity
  • Threats to External Validity
    • The Problem of External Validity
    • Nonrepresentative Sampling of Units
    • Nonrepresentative Research Context
    • Summing Up External Validity
  • Conclusion
  • Review Questions and Exercise

A Quick Guide to Chapter 5: An Introduction to Research Design

Hypothesis-testing research is based on comparison. To conclude that a putative cause actually does influence the behavior in question, the researcher must observe the behavior in the absence ...

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