It's much easier to find a group of Adventists that have an above average lifespan because Adventists form a community. People with blue eyes or people who are left handed who live in the same county don't all know each other and discuss their statistically insignificant longevity
Doesn’t county or town/cities (doesn’t know the diff in US) counts for "communities", and aren’t those separated in groups while doing national stats? The dice rolling groups are obviously here and have probably been surveyed many time, didn’t they?
