What kind of sample? At a party there are 30 students over age 21 and 20 students under age 21. You choose at random 3 of those over 21 and 186 Part I Review separately choose at random 2 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 23–28 and 65–69.)