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A printing company has a machine that folds brochures for mailing. Sometimes the machine can have problems that cause it to do improper folds. To monitor this process, the company selects a sample of 50 brochures from every order and counts the number of incorrectly folded items in each sample. The data are found below. Complete parts a through d. ES Click the icon to view the data. a. What is the appropriate control chart to use to monitor this process? OA. Ac-chart O B. An x-chart ° C. Both an R-chart and an x-chart OD, An R-chart OE. Ap-chart b. Use the data to construct the appropriate control chart. Which graph below shows the appropriate chart for the data? O B. C. O D, 0.1 0.1 0.1c. Suppose that for the next three orders, sample sizes of 50 brochures are examined with sample 21 having 2 bad folds, sample 22 having 3 bad folds, and sample 23 having 1 bad fold. Plot the additional data to the existing control chart and determine whether any of the control chart signals are present. Is the process in control? 0 A. With the 3 new points, 6 points in a row are decreasing, which indicates that the process has gone out of control. B. With the 3 new points, 9 points in a row are above the centerline, which indicates that the process has gone out of control. ° C. Since several points are above the upper control limit, the process was never in control. O D. Since all of the points are between the control limits, the process is in control 0 E. Since the 3 new points are outside the control limits, the process has gone out of control. d. Suppose that the next sample of 50 after the three from part c has 12 improperly folded brochures. What conclusions should be based on the control chart? ○ A with the new point, at least 6 points in a row are decreasing, which indicates that the process has gone out of control. B. Since the new point is oulside the control limits, the process has now gone out of control ○ C. With the new point, at least 9 points in a row are above the centerline, which indicates that the process has gone out of control. 0 D. Since at least one of the points is outside the control limits, the process is still in control.Sample Number of Improper Folds 2 3 10 12 13 14 15 16 17 18 19 20 3

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