I.13 What kind of sample? At a party, there are 30 students over age 21 and 20 students under age 21. You choose at random six of those over 21 and separately choose at random four of those under 21 to interview about attitudes toward alcohol. You have given every student at the party the same chance to be interviewed: what is that chance? Why is your sample not an SRS? What is this kind of sample called? (Hint: See pages 24–27 and pages 73–75.)