26.20 Example: Do most smurfs like ice cream?

http://www.scq.ubc.ca/tragedy-of-the-commons-explained-with-smurfs/

26.20.1 Bias can be introduced by good intentions

• We may intentionally choose to select Papa Smurf and Smurfette
  • to ensure representation while reducing the cost of the sample
  • however, be aware of and acknowledge the bias