38%, 14. A cashier asks every 5th customer if they found everything they needed today. [C] Self-selected [D] Simple Random [A] Systematic [B] Convenience 15. A researcher divides a sample of adults into subgroups by ages: 18-29, 30-39, 40-49, 50-59, and 60 and above. She then asks one person from each subgroup about their opinion on the current mayor. [C] Self-selected [D] Stratified [A] Cluster [B] Simple Random 16. Paige asks everyone that rides her bus if they prefer gummi worms or gummi bears. [A] Cluster [D] Simple Random [C] Self-selected [B] Convenience 17. The senior class sponsors post QR codes around the building so students may scan the code and vote for their senior class officers. [A] Cluster [C] Self-selected [B] Convenience [D] Simple Random 18. Mr. Patz conducts a survey of the math teachers in the department. He puts all 20 names in a ha randomly selects 5 names. [A] Cluster [B] Convenience [C] Self-selected [D] Simple Random