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.A quality analyst wants to construct a sample mean and ange charts for controlling a packaging process. le knows from past experience that when the process is op- rating as intended, packaging weight is normally distributed rith a mean of twenty ounces, and a process standard devia- on of two ounces. Each day last week, he randomly selected pur packages and weighed each. The data he collected ap- ear below in ounces. (b) With a value of z that would provide 99.73% confidence, construct an Xbar and R charts for this process. what do you conclude about the process – is it in control? Answer: 2. Pairs of Yeezy sneakers are supposed to weigh exactly Ikg. Inspectors want to develop process control charts. They take ten samples of six pairs each and weigh them. Based on the following data (in kg), compute the lower and upper control limits and determine whether the process is in control. Note that the overall standard deviation of the population is un- known. Package Package ? Package3 Package 4 Day Moaday 23 22 23 24 Tunday 23 21 19 21 Wedaesday 20 19 20 21 Thunday 18 19 20 19 Friday 18 20 22 20 Sample Mean Range 120 a) If he sets an upper control limit of 21 and a lower control mit of 19 around the target value of 20 ounces, the control hart is based on what value of z? 90 30 L10 100 130 L10 95 answer: 1.20 145

.A quality analyst wants to construct a sample mean and ange charts for controlling a packaging process. le knows from past experience that when the process is op- rating as intended, packaging weight is normally distributed rith a mean of twenty ounces, and a process standard devia- on of two ounces. Each day last week, he randomly selected pur packages and weighed each. The data he collected ap- ear below in ounces. (b) With a value of z that would provide 99.73% confidence, construct an Xbar and R charts for this process. what do you conclude about the process – is it in control? Answer: 2. Pairs of Yeezy sneakers are supposed to weigh exactly Ikg. Inspectors want to develop process control charts. They take ten samples of six pairs each and weigh them. Based on the following data (in kg), compute the lower and upper control limits and determine whether the process is in control. Note that the overall standard deviation of the population is un- known. Package Package ? Package3 Package 4 Day Moaday 23 22 23 24 Tunday 23 21 19 21 Wedaesday 20 19 20 21 Thunday 18 19 20 19 Friday 18 20 22 20 Sample Mean Range 120 a) If he sets an upper control limit of 21 and a lower control mit of 19 around the target value of 20 ounces, the control hart is based on what value of z? 90 30 L10 100 130 L10 95 answer: 1.20 145

Practical Management Science
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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.A quality analyst wants to construct a sample mean and ange charts for controlling a packaging process. le knows from past experience that when the process is op- rating as intended, packaging weight is normally distributed rith a mean of twenty ounces, and a process standard devia- on of two ounces. Each day last week, he randomly selected pur packages and weighed each. The data he collected ap- ear below in ounces. (b) With a value of z that would provide 99.73% confidence, construct an Xbar and R charts for this process. what do you conclude about the process – is it in control? Answer: 2. Pairs of Yeezy sneakers are supposed to weigh exactly Ikg. Inspectors want to develop process control charts. They take ten samples of six pairs each and weigh them. Based on the following data (in kg), compute the lower and upper control limits and determine whether the process is in control. Note that the overall standard deviation of the population is un- known. Package Package ? Package3 Package 4 Day Moaday 23 22 23 24 Tunday 23 21 19 21 Wedaesday 20 19 20 21 Thunday 18 19 20 19 Friday 18 20 22 20 Sample Mean Range 120 a) If he sets an upper control limit of 21 and a lower control mit of 19 around the target value of 20 ounces, the control hart is based on what value of z? 90 30 L10 100 130 L10 95 answer: 1.20 145
Transcribed Image Text:.A quality analyst wants to construct a sample mean and ange charts for controlling a packaging process. le knows from past experience that when the process is op- rating as intended, packaging weight is normally distributed rith a mean of twenty ounces, and a process standard devia- on of two ounces. Each day last week, he randomly selected pur packages and weighed each. The data he collected ap- ear below in ounces. (b) With a value of z that would provide 99.73% confidence, construct an Xbar and R charts for this process. what do you conclude about the process – is it in control? Answer: 2. Pairs of Yeezy sneakers are supposed to weigh exactly Ikg. Inspectors want to develop process control charts. They take ten samples of six pairs each and weigh them. Based on the following data (in kg), compute the lower and upper control limits and determine whether the process is in control. Note that the overall standard deviation of the population is un- known. Package Package ? Package3 Package 4 Day Moaday 23 22 23 24 Tunday 23 21 19 21 Wedaesday 20 19 20 21 Thunday 18 19 20 19 Friday 18 20 22 20 Sample Mean Range 120 a) If he sets an upper control limit of 21 and a lower control mit of 19 around the target value of 20 ounces, the control hart is based on what value of z? 90 30 L10 100 130 L10 95 answer: 1.20 145
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