Which data collections show bias? check all that apply.
(a)an english teacher polls the top-ten most avid readers to find their favorite books. an insurance company polls drivers of sports cars to find their average number of tickets.
(b)-a restaurant manager surveys every tenth customer for one week.
(c)-an assistant principal surveys each student who is sent for discipline.
(d)-a fundraiser organizer draws five names from a hat that contains all entries.