I was going to the races and a work friend (who knows little about horses) wrote down the name of three horses of which he had heard. When I pulled out the piece of paper I had forgotten who wrote it, but noticed that one of the horses had won. I consequently bet on all of the other horses. I did not win. What is the term that describes the phenomenon where individuals make decisions based on the actions or opinions of others?
1) Social-responsibility norm
2) Normative social influence
3) Sleeper effect
4) Attitude formation
5) Social exchange theory
