For which survey is a sample not necessary? What percentage of Colorado residents support planting more trees in the community? Which electronic gadget will be the most popular among middle school students

For which survey is a sample not necessary?

What percentage of Colorado residents support planting more trees in the community?
Which electronic gadget will be the most popular among middle school students this year?
Do your classmates prefer warm or cool places to travel for vacation?
How many car accidents involve air bag malfunctions?

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