Amanufacturer receives parts from two suppliers. a simple random sample of 400 parts from supplier 1 finds 20 defective. a simple random sample of 200 parts from supplier 2 finds 20 defective. let p1 and p2 be the proportion of all parts from suppliers 1 and 2, respectively, that are defective. test whether the defective rates of the parts from two suppliers are significant different at the 1% significance level. conduct a hypothesis testing. answer the next three questions.