You may have heard that yawning is contagious How could you

You may have heard that yawning is contagious. How could you design a study to test whether people are more likely to yawn if they see someone else yawn?

Objectives:

1. Explain how you could carry out a study to test whether yawning is contagious. Try to take into account the principles of comparison, randomization, and blindness to control for confounding (lurking) variables.