2. fasten-it-all produces wood and metal screws. the screws must be manufactured to within certain tolerances or they are considered defective. using 99% confidence, a machine that may be producing more than 1.35% defective screws must be shut down. to test machine 1, a qc inspector randomly samples 1000 screws. the qc inspector’s random sample of 1000 screws contains 8 defective screws. a. based on this sample, compute by hand (using the normal approximation to the binomial) and interpret a 99% confidence interval for machine 1’s defect rate. confirm your result with minitab.