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Awareness and Analysis of Error

Neil Andrew Wells
Initial Publication Date: September 26, 2007

Summary

Use this activity to introduce students to the concepts of reproducibility and error and to discuss distinctions between error, uncertainty, precision, and accuracy. Students measure the distance between two points on a paper several times with a variety of rulers then compare their results and calculate their average error, which often turns out to be 0.1 mm. The significance of error can be shown by applying this exercise to a larger scale situation, such as using maps and aerial photographs to determine river width to build a bridge.


Learning Goals

  • Understand and appreciate the significance of error.

Context for Use

This activity is appropriate for secondary school and undergraduate-level introductory geoscience courses.

Description and Teaching Materials

The following materials are required:
  • A variety of plastic, wood, and metal rulers.
  • Maps and aerial photographs of the same area.

References and Resources

Wells, N.A., 1998, A Simple Exercise about Awareness and Analysis of Error, Journal of Geoscience Education, v. 46, p. 476-478