in exercise 11-20 determine whether the at set is a population or a sample. explain your reasoning. 11. the salary of each employee of an advertising firm. 12. the amount of energy collected from every solar panel on a photovoltaic power plant. 13. the survey of 250 members from an organized union of over 20,000 members. 14. the annual revenue of each team in a pro sports league 15. the carbon monoxide levels of 12 of 49 people who escaped a burning building 16. the number of electoral college votes for each state in the U.S and the district of columbia 17. the number of guests in each room of a hotel. 18. the amount spent by every tenth person cashing out at a store 19. the nationality of every person passing through a customs station 20. the precipitation amounts at 15 locations in a county