# Coin flip preference

- Author:
- Steve Phelps

Out of 30 participants in the class, 19 of them said they would call "heads" if asked to call the result of a coin flip. Is this "19 out of 30" statistically unusual (statistically significant)?

In the simulation below, each dot represents the number of people who would choose heads out of 30 if there really was no difference between the chance of calling heads or tails.
There are 1000 trials displayed below. It appears that around 9% of the time, we should expect 19 (or more) people to choose heads just by chance.