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Mathematics, 01.02.2021 03:30 sierraseideman1023

An environmental agency worries that many cars may be violating clean air emission standards. The agency hopes to check a sample of vehicles in order to estimate that percentage with a margin of error of 3% and 99% confidence. To gauge the size of the problem, the agency first picks 60 cars and finds 15 with faulty emissions. How many should be sampled for a full investigation?

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