a quality control supervisor is looking at production machines used to fabricate steel pins for a particular product assembly. the desired specifications for acceptable pins is for a diameter of 3.52mm, with acceptable pins being within +/- 0.1mm the machine must be realigned to the target diameter if it appears that the population mean for all rods produced by that machine is different than 3.52mm at the 95% confidence/5% significance. a machine must be recalibrated for consistency if it appears that the population percentage (proportion) of unacceptable rods is above 10%, again at 95% confidence/5% significance.