The Pepsi-Cola Company carried out research to determine whether people tended to prefer Pepsi Cola to Coca Cola. Participants were asked to taste two glasses of cola and then state which they preferred. The two glasses were not labeled Pepsi or Coke for obvious reasons. Instead, the Coke glass was labeled Q, and the Pepsi glass was labeled M. The results showed that “more than half chose Pepsi over Coke” (Huck and Sandler, 1979, p. 11). Are there any alternative explanations for the observed difference, other than the taste of the two drinks? Explain how you would carry out a study to assess any alternative explanation you think possible.
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