Which is the best way to choose a random sample of people from a sold-out movie audience for a survey?

The best way is to completely randomize the people you pick, and get a large array of diverse people. People of different ages, sizes, living in different places. You can do this by gathering all of the people’s phone numbers, randomizing them, then calling quite a few. Make sure you get many people. This way, it will be unbiased.

Hope this helps! Comment if you have any questions or concerns! :)