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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 …