Developed by Galloway, R. K., Bates, S. P., Maynard-Casely, H. E., & Slaughter, K. A.
|Purpose||To measure quantitative data handling skills.|
|Focus||Lab skills (accuracy & precision, functional forms, line fitting, quantitative error analysis)|
|Level||Upper-level, Intermediate, Intro college|
This is the second highest level of research validation, corresponding to at least 5 of the validation categories below.
Research Validation Summary
Based on Research Into:
- Student thinking
- Student interviews
- Expert review
- Appropriate statistical analysis
- At multiple institutions
- By multiple research groups
- Peer-reviewed publication
The topics included on the DHD were determined by instructors that had experience teaching relevant courses. The developers then created questions for these topics, created an initial version of the test, and iteratively developed it using expert review and student input. The DHD was tested with over 1200 students in the UK and Ireland, and revised. Appropriate statistical analyses of reliability, difficulty and discrimination were performed, and reasonable values found. Information about the DHD has been published in one publication.
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