Question

To examine whether planting trees reduces air pollution, we find a sample of city blocks with similar evels of air pollution and we then plant trees in one half of these city blocks. After the trees have grown sufficiently, the air pollution levels are measured. Describe why this is either an observational study or an experimental study
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Answer #1

This is a experimental study as first the pollution level is measured and then to study the effect of trees on pollution, new trees and planted in half of the cities and pollution level is measured again. Thus here is human intervention and hence experimental study.

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