(Answered)-An environmental agency worries that many cars may be violating - (2025 Updated Original AI-Free Solution
Question
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 3% and 99% confidence. To gauge the size of the problem, the agency first picks 40 cars and find 4 faulty emissions systems. How many should be sampled for full investigation ?