During the 2010 Super Bowl, the Snicker's candy bar campaign was voted the best ad by women 18 or older, men 18 or older, and you 17 or younger. This ad features a neighborhood football game in which one player, who has flagging energy, is repeatedly tackled. His teammates tell him, "You play like Betty White!" The octogenarian (a person who is 80 to 89 years old) actress and comedian appears in the ad being tackled. If you were AdBowl.com, how would you draw the sample to measure the best Super Bowl ad among the three groups of interest?