OPERATIONS MANAGEMENT CNCT W/EBK
OPERATIONS MANAGEMENT CNCT W/EBK
14th Edition
ISBN: 9781264344017
Author: Stevenson
Publisher: MCG
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Chapter 10, Problem 7P
Summary Introduction

To determine: The upper and lower control limits for the fraction and decide if the process is in control.

Introduction: Quality is a measure of excellence or a state of being free from deficiencies, defects and important variations. It is obtained by consistent and strict commitment to certain standards to attain uniformity of a product to satisfy consumers’ requirement.

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Southern Mills Company One of the stages in the process of making denim cloth at the Southern Mills 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 may 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. Construct a c-chart using 3 limits for this process and indicate if the process was out of control at any time. Number of Number of Sample Breaks Sample Breaks 1 3 11 2 12 4 3 4 13 6 1 14 7 5 5 15 8 6 3 16 6 7 2 17 5 8 4 18 7 19 8 10 2 20 6
Breeze Toothpaste Company has been having a problem with some of the tubes of toothpaste leaking. The tubes are produced in lots of 100 and are subject to 100% visual inspection. The latest 25 lots produced yielded 112 rejected toothpastes. Calculate the central line and control limits to monitor this process?
One of the stages in the process of making denim cloth at the Southern Mills 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 may 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.   Construct a c-chart using 3 limits for this process and indicate if the process was out of control at any time.
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