OPER MGMT IN SUPPLY CHAIN ACCESS CARD
7th Edition
ISBN: 9781260943184
Author: SCHROEDER
Publisher: INTER MCG
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Question
Chapter 9, Problem 6P
a)
Summary Introduction
To setup: X bar and R control charts.
b)
Summary Introduction
To determine: If the process is under control.
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Students have asked these similar questions
A green belt is going to monitor the process by collecting more than 10 samples per group. Which of the following control charts would be most appropriate ?
a. I-MR
b. Xbar R
c. X bar S
d. np chart
(Don't Hand writing in solution) .
You pull 5 bags of chips off of the production line every hour. The process is currently under control.
The average weights are calculated for each sample, and the average of those averages is 129.1.
The ranges are calculated for each sample, and the average of those ranges is 4.1.
What is the Upper Control Limit for the X-bar chart? Round your answer to one decimal place.
Why are most processes not in statistical control when they are first sampled for control chart purposes?
*250 words minimum. Thank you!
Chapter 9 Solutions
OPER MGMT IN SUPPLY CHAIN ACCESS CARD
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- The Watson Electric Company produces incandescent light bulbs. The following data on the number oflumens for 40-watt light bulbs were collected when the process was in control.a. Calculate control limits for an R-chart and an x-chart.b. Since these data were collected, some new employees were hired. A new sample obtained the fol-lowing readings: 625, 592, 612, and 635. Is the process still in control?arrow_forwardDiscuss what determine the width of the control limits in a process chart ?arrow_forwardThe inner diameter of piston rings follows a normal distribution with mean 75mm and variance =9. The sample size is 5, X-bar chart is established. If L =2, what is the type I error rate when process is in-control? If we change the control limits to UCL = 78.354, and LCL = 71.646, what is Type I error rate?arrow_forward
- A quality inspector took five samples in five hours, each with four observations, of the length time for glue to dry. The analyst compute the mean of each sample and the computed the grand mean. All values are in minutes. Use this information to obtain three-sigma control limits for means. It is known from previous experience that the standard deviation of the process is 0.02 minutes. Draw a control chart Please provide a step-by-step solutionarrow_forwardThe Watson Electric Company produces incandescent light bulbs. The following data on the number oflumens for 40-watt light bulbs were collected when the process was in control. a. Calculate control limits for an R-chart and an x-chart.b. Since these data were collected, some new employees were hired. A new sample obtained the following readings: 625, 592, 612, and 635. Is the process still in control?arrow_forwardConstruct the appropriate control chart for the 11 observations, and determine if the process is in control using two sigma limits. No. of defects per unit for the observations are: 11, 6, 5, 2, 7, 7, 8, 4, 9, 3, 1. a. 3 observations out of control b. 1 observations out of control c. 2 observations out of control d. Under controlarrow_forward
- x and R Control Charts A cereal manufacturer fills cereal boxes to an averageweight of 20 ounces and has an average range of 2 ounces when the filling process is in control. A sample size of 10 boxes is used in evaluating the process.a. What are the CL, UCL, and LCL for the x and R charts?b. A sample with the following 10 measurements was just taken: 20, 21, 19, 18, 19, 21,22, 20, 20, 19. Is the process still in control?arrow_forwardWhat determines the width of the control limits in a process chart?arrow_forward13-When all work is inspected at each stage of the process this is known in Total Quality Control as ? A.Process inspection workers . B.Process inspection after production C.Process inspection filed . D.in-process inspectionarrow_forward
- Your supervisor, Lisa Lehmann, has asked that you report on the output of a machine on the factory floor. This machine is supposed to be producing optical lenses with a meanweight of 50 grams and a range of 3.5 grams. The following table contains the data for a sample size of n = 6 taken during the past 3 hours: a) What are the :X-chart control limits when the machine is working properly?b) What are the R-charL control limits when the machine is working properly?c) What seems to be happening? (Hint: Graph the data points. Run charts may be helpful.)arrow_forwardCheckout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and the sample means and ranges computed: Sample Mean Range 1 3.06 .42 2 3.15 .50 3 3.11 .41 4 3.13 .46 5 3.06 .46 6 3.09 .45 Using the factors in Table 10.3 , determine upper and lower limits for mean and range charts. Is the process in control?arrow_forwardShift in the process mean for a measured variable would be best detected by a O a. p chart P b. chart Of. a chart O d. x barchart O e. R Chartarrow_forward
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