A researcher wanted to know whether people in his community like Coca-Cola or Pepsi. He found some people who like Coca-Cola and asked them to point out their preferences through tasting in a glass of Coca-Cola and a glass of Pepsi. The cups are not labeled to avoid trademarks. It caused obvious prejudice
In another controlled experiment conducted on the participants of the experiment, an interesting result was found: Most of these participants prefer the number l to the number 2.
it was marked as 1 on Pepsi, and the Coca-Cola cup was marked as 2. The results showed that more than half of people prefer Pepsi to Coca-Cola.