A video game designer launches a new game and allows subscribers a free trial if they provide a product view of the game. Identify the types of bias that this survey suffers from.
Option #1: Under-coverage bias because only subscribers provide a product veiw. non subcribers are not included
Option #2: voluntary response bias because the participants are self selected
Option #1: Selection bias because only subscribers are given the opportunity to participate in the free trial in exchange for a product view.
Option #2: Self-selection bias because individuals who choose to participate may have a particular interest or bias towards the game.