Statistical Surveys: Bias in a Sample

Specifically choose a place where enthusiasts of your survey would frequent, e.g. a sports bar when asking whether people like football, a coffee shop when asking if people think coffee is good or bad for you, a vegan restaurant when asking about animal cruelty, etc.

Specifically choose a place where enthusiasts of your survey would not frequent, e.g. a dog park when asking if people own cats, a burger joint when asking who is vegetarian, etc.

A place like a school where there is a very densely populated group of people all of similar age.

A place like a mall where you get a wide variety of people from all walks of life.