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An environmental agency worries that many cars may be violating clean air emissions standards. The agency...

An environmental agency worries that many cars may be violating clean air emissions standards. The agency hopes to check a sample of vehicles in order to estimate that percentage with a margin of error of 4​% and 99​% confidence. To gauge the size of the​ problem, the agency first picks 50 cars and finds 7 with faulty emissions systems. How many should be sampled for a full​ investigation?

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