You are a researcher for a professional research firm. Your firm has won a contract to conduct a study for a technology publication. The editors of the publication would like to know their readers' thoughts on using smartphones for making and receiving payments, for redeeming coupons and as tickets to events. They would also like to know whether people are interested in using smartphones as digital wallets that store data from drivers' licenses, health insurance cards, and other cards. The editors have given you their readership database and 20 questions they would like to ask (See sample questions and results in graphics below). You know that it is too expensive to contact all the readers, so you need to determine a way to contact a representative sample of the entire readership population