When the State of Wisconsin directly administered its vehicle emissions testing system, the average monthly failure rate for vehicles testing in Milwaukee County was 10.8%. In 2013, the state contracted out with private automotive repair shops to perform vehicle emissions testing. Some state legislators have expressed concerns that this new system might create an incentive for providers to purposely inflate failure rates. The State Legislative Research Bureau is asked to gather a random sample of 150 inspection reports from Milwaukee County for the past month. The data reveal 13% of the vehicles with failed emissions tests. Based on these data, what can the Research Bureau tell the legislators? you need to compute a 95% confidence interval.

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Here sample proportion p 013 samplesizen 150 standard error of sample proportion sqrt013 ... View the full answer