How many should be sampled for a full investigation

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A state's environmental agency worries that many cars may be violating clean air emissions stan dards. The agency hopes to check a sample of vehicles in order to estimate that percentage with a margin of error of 3% and 90% confidence.

To gauge the size of the problem, the agency first picks 60 cars and finds 9 with faulty emissions systems. How many should be sampled for a full investigation?

Reference no: EM131419905

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