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Teaching tip: the invisible hand of randomisation
  1. Sharon Sanders, MBBS, MSc,
  2. Grad Dip Child Devel, FAFPHM
  1. Department of General Practice, University of Queensland
 Brisbane, Queensland, Australia

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    This engaging activity, fun for students and teachers alike, shows both the benefits of randomisation and allocation concealment. It can also show the problems that may arise as a result of subversion of the process and small study size.

    METHOD: Purchase 2 different types of wrapped lollies (aka candy or sweets) and a pack of opaque envelopes. Place the lollies in the envelopes and seal. Arrange the envelopes as for …

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