One of the stages in the process of making denim cloth at the Southern Stars Company is to spin cotton yarn onto spindles for subsequent use in the weaving process. Occasionally the yarn breaks during the spinning process, and an operator ties it back together. Some number of breaks is considered normal; however, too many breaks might mean that the yarn is of poor quality. In order to monitor this process, the quality-control manager randomly selects a spinning machine each hour and checks the number of breaks during a 15-minute period. Following is a summary of the observations for the past 20 hours: Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Number Defective 3 2 4 1 5 3 2 4 0 2 3 st 4 6 7 8 6 5 7 8 6 a. Construct a c -chart using 3Q limits for this process and indicate if the process was out of control at any time. b. Please make recommendations about further actions based on results.
One of the stages in the process of making denim cloth at the Southern Stars Company is to spin cotton yarn onto spindles for subsequent use in the weaving process. Occasionally the yarn breaks during the spinning process, and an operator ties it back together. Some number of breaks is considered normal; however, too many breaks might mean that the yarn is of poor quality. In order to monitor this process, the quality-control manager randomly selects a spinning machine each hour and checks the number of breaks during a 15-minute period. Following is a summary of the observations for the past 20 hours: Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Number Defective 3 2 4 1 5 3 2 4 0 2 3 st 4 6 7 8 6 5 7 8 6 a. Construct a c -chart using 3Q limits for this process and indicate if the process was out of control at any time. b. Please make recommendations about further actions based on results.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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