1. An inspector visually inspects 200 sheets of paper at a time for aesthetics. Using trained judgment, the inspector will either accept or reject sheets based on whether they are flawless. Following are the results of the recent inspections: Sample 1 2 3 4 5 6 7 8 9 10 Defectives 15 19 21 23 35 7 15 21 18 17 a. Given these results, using a p-chart, determine if the process is stable. b. What would need to be done to improve the process? 2. During a quality inspection program, a PVC manufacturer finds following number of defective products in each sample of 200 units. Sampl Defectives e Sample Defectives 1 95 16 102 2 50 17 39 3 67 18 19 4 48 19 67 5 45 20 69 6 68 21 68 7 48 22 65 8 36 23 40 9 37 24 41 10 45 25 107 11 42 12 43 13 97 14 99 15 105 Construct and interpret an appropriate attribute control chart to see if the process is in control. (Hint: first identify which chart you should use and then perform the calculations). 3. An industrial distribution firm uses control chart to track the performance of newly hired sales trainees. The company keeps track of number of mistakes made in an account as the measure of their sales performance. In a recent study, the company found that there were large numbers of mistakes made by the trainees while working on their accounts. The data given below shows the sample account and the number of mistakes (also known as, defects) made on each account. Construct and interpret an appropriate attribute control chart using the following data: Sample Defects 10 8 1 9 11 10 2 7 12 9 3 12 13 10 4 9 14 12 5 12 15 10 6 7 Sample Defects 7 9 16 10 8 9 17 6 9 9 18 4 19 1 25 12 20 0 26 4 21 18 27 3 22 6 28 4 23 9 29 3 24 10 30 4 4 - What do you think of their Sales Process? Is it in-control