A textile manufacturer wants to set up a control chart for irregularities (e.g., oil stains, shop soil, loose threads, a

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A Textile Manufacturer Wants To Set Up A Control Chart For Irregularities E G Oil Stains Shop Soil Loose Threads A 1 (69.46 KiB) Viewed 23 times

A textile manufacturer wants to set up a control chart for irregularities (e.g., oil stains, shop soil, loose threads, and tears) per 100 square yards of carpet. The following data were collected from a sample of twenty 100-square-yard pieces of carpet: Sample Irregularities Sample Irregularities 1 7 6 17 2 7 7 9 3 13 8 13 4 9 16 5 12 10 11 Sample Irregularities 11 18 12 13 13 6 14 8 15 7 Sample Irregularities 16 6 17 11 18 11 19 11 20 6 9 a. Using these data, set up a c-chart with z= = 3 The UCL, equals and the LCLc equals (Enter your responses rounded to two decimal places.) b. Suppose that the next five samples had 16, 14, 21, 19, and 20 irregularities. What do you conclude? O A. All of the sample points are within the control limits, so the process is in control. O B. All of the sample points are within the control limits, so the process is not in control. OC. At least one of the sample points is within the control limits, so the process is in control. OD. At least one of the sample points is greater than the upper controllimit, so the process is not in control. O E. At least one of the sample points is greater than the lower control limit, so the process is not in control. OF. At least one of the sample points is less than the upper control limit, so the process is not in control.