NR449 W5

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Chamberlain College of Nursing *

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449

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Psychology

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Feb 20, 2024

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docx

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1. What is the difference between internal and external validity? Internal Validity: This refers to the degree to which an experimentation or analysis accurately calculates what it plans to measure. In other words, it evaluates whether the observed outcomes can be attributed to the manipulated variables and not to different aspects. High internal validity indicates that the study's structure and execution undervalue the influence of confounding variables. External Validity: External validity, on the other hand, pertains to the generalizability of the study's findings to populations, settings, and times beyond the specific conditions of the study. High external validity means that the results can be applied to a broader context. Internal validity is essential for drawing accurate conclusions within the study context, while external validity is significant for applying findings to more general situations. Mention how experimental design, randomization, and control groups contribute to internal validity. Discuss how sample representativeness, ecological validity, and temporal validity influence external validity. Examples: In an experimental environment, controlling the environment tightly improves internal validity, but it might restrict the generalizability of discoveries to real-world concerns (external validity). For instance, a drug effectiveness analysis performed in a lab may have high internal validity but might not generalize well to diverse populations. Reference: Campbell, D. T., & Stanley, J. C. (1963). Experimental and Quasi- Experimental Designs for Research.
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