Question 11. Two different types of injectionmolding machines are used to form plastic parts. A pmt is censidered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300, are selected, and 15 defective parts are found in the sample from mad-ne II and 3 defective parts are found in the sample from machine 2. (a) Is it reasenahle to conclude that. both machines produce the same fraction of defective parts, using a = 0.05? Find the Pvalne for this test. (h) Construct a 95% condence interval en the di'erence in the two fractions defective