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A new curriculum improved students' understanding of biological variation in experimental design. This model-based approach enhanced quantitative and conceptual skills, showing lasting effects beyond the initial course.

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Area of Science:

  • Biology Education Research
  • Quantitative Biology
  • Scientific Inquiry

Background:

  • Biological research requires integrating conceptual and quantitative understanding of variation.
  • Students often struggle with variation due to curricula separating these concepts.
  • Effective teaching of variation is crucial for experimental design and analysis skills.

Purpose of the Study:

  • To assess the impact of a model-based curricular intervention on students' understanding of variation.
  • To determine if the intervention improves both conceptual and quantitative grasp of variation in biology.
  • To evaluate the intervention's effectiveness in the context of experimental design and analysis.

Main Methods:

  • Implemented a five-module model-based intervention curriculum in an introductory biology lab.
  • Assessed student understanding of variation using a validated 16-question multiple-choice instrument.
  • Calculated normalized gain scores to compare students with and without the intervention.

Main Results:

  • Students receiving the intervention demonstrated significantly higher normalized gains in understanding variation.
  • The intervention's positive effect was independent of student gender or prior statistics coursework.
  • Improved understanding persisted into the subsequent semester's laboratory course.

Conclusions:

  • Model-based approaches are effective in enhancing students' understanding of biological variation.
  • Curricular interventions can successfully bridge the gap between conceptual and quantitative understanding of variation.
  • This approach supports better integration of variation concepts in biological experimental design and analysis.