Miles randomly surveys a group of customers at a coffee shop to understand the coffee consumption habits of 18-to 24 year old Americans is this a valid random sample?

Question

Tigerslsu · Answer

???

Vocaloid · Answer

if he's at this one specific coffee shop, does that represent ALL 18-24 coffee drinking habits? what about people who don't go to coffee shops? what about people who don't like coffee?

Vocaloid · Answer

this is a small-ish website, please be patient when receiving answeres