A random sample of 500 parts has been collected from a production line. The number of nonconforming parts was found to be 15. Generate a 95% confidence interval for the proportion nonconforming. Record your answers to 3 places after the decimal point (e.g. X.XXX). Based upon a 95% confidence level, the lower confidence limit of it is Based upon a 95% confidence level, the upper confidence limit of it is A random sample of 250 extruded bars (18 feet long and 2 inches in diameter) were inspected for surface defects (indications) with an Eddy Current tester. The average number of indications per bar was computed to be c = 2.58. Record your answers to 3 places after the decimal point (e.g. X.XXX). Based upon a 90% confidence level, the lower confidence limit of a is Based upon a 90% confidence level, the upper confidence limit of a is