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Keywords:

  • Teaching;
  • Experimental design;
  • Hands-on activity;
  • Introductory statistics;
  • Cockroach

Summary

Understanding the roles of random selection and random assignment in experimental design is a central learning objective in most introductory statistics courses. This article describes an activity, appropriate for a high school or introductory statistics course, designed to teach the concepts, values and pitfalls of random selection and assignment using the not-easily-forgotten Madagascar hissing cockroach. Evidence is summarized demonstrating conceptual gains for students performing the Randomizing Roaches activity, and follow-up activities are suggested.