1. (p-chart) A tire manufacturer has been concerned about the number of defective tires found recently. in order to evaluate the true magnitude of the problem, a production manager selected 10 random samples of 20 units each for inspection. The number of defective tires found in each sample are as follows: (a) Develop a p-chart. (b) Suppose that the next four samples selected had 6, 3, 3, and 4 defects. Use the p-chart created in (a) to determine whether the process is out of control. 2. ( x-bar chart) A quality control manager at a manufacturing facility has taken four samples (each column is a sample) with four observations each of the diameter of a part. Develop an x-bar chart