OPERATIONS MANAGEMENT LL PACKAGE
11th Edition
ISBN: 9781323592632
Author: KRAJEWSKI
Publisher: Pearson Custom Publishing
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Chapter 3, Problem 7P
a)
Summary Introduction
Interpretation: calculation of control charts
Concept introduction: Thechart of control is a graph utilized to analysis how a procedure changes over time. Data are mapped in time request. Each time incontrol chart, for the upper control limit there is upper line,central line for the average and for the lower control limit there is lower line.
b)
Summary Introduction
Interpretation: plot the observations on control chart.
concept introduction::The chart of control is a graph utilized to analysis how a procedure changes over time. Data are mapped in time request. Each time in control chart, for the upper control limit there is upper line,central line for the average and for the lower control limit there is lower line.
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Webster Chemical Company produces mastics and caulkingfor the construction industry. The product is blended inlarge mixers and then pumped into tubes and capped.Management is concerned about whether the filling processfor tubes of caulking is in statistical control. The processshould be centered on 8 ounces per tube. Several samplesof eight tubes were taken, each tube was weighed, and theweights in Table 3.3 were obtained.
a. Assume that only six samples are sufficient and developthe control charts for the mean and the range.b. Plot the observations on the control chart and commenton your findings.
Webster Chemical Company produces mastics and caulking for the construction industry. The product is blended in large mixers and then pumped into tubes and capped. Management is concerned about whether the filling process for tubes of caulking is in statistical control. The process should be centered on 8 ounces per tube. Several samples of eight tubes were taken, each tube was weighed, and the weights in Table were obtained.
Ounces of Caulking Per Tube
Tube Number
Sample
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7.98
8.33
7.89
8.24
7.87
8.13
8.34
8.22
7.77
8.18
8.13
8.14
8.02
8.08
7.91
7.83
7.92
8.11
7.94
8.51
8.04
8.05
7.99
8.13
8.44
8.41
8.00
7.90
8.10
8.14
7.68
8.28
7.89
8.16
7.81
8.12
7.81
8.09
7.93
7.97
8.14
8.13
8.11
8.16
8.09
8.07
7.88
8.14
a. Assume that only six samples are sufficient and develop the control charts for the mean and the range.b. Plot the observations on the control chart and comment on your findings.
Why is it important to prove that a process is proven capable before developing statistical control limits (i.e., SPC charts)?
Chapter 3 Solutions
OPERATIONS MANAGEMENT LL PACKAGE
Ch. 3 - Should a very pricey handcrafted object of beauty...Ch. 3 - Prob. 2DQCh. 3 - Prob. 3DQCh. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7P
Ch. 3 - Prob. 8PCh. 3 - Prob. 9PCh. 3 - Prob. 10PCh. 3 - Prob. 11PCh. 3 - Prob. 12PCh. 3 - Prob. 13PCh. 3 - Prob. 14PCh. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - Prob. 17PCh. 3 - Prob. 18PCh. 3 - Prob. 19PCh. 3 - Prob. 20PCh. 3 - Prob. 21PCh. 3 - Prob. 22PCh. 3 - Prob. 23PCh. 3 - Prob. 24PCh. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Prob. 29PCh. 3 - Prob. 31PCh. 3 - Prob. 1AMECh. 3 - Prob. 2AMECh. 3 - Prob. 3AMECh. 3 - Prob. 4AMECh. 3 - Prob. 5AMECh. 3 - Prob. 1VCCh. 3 - Prob. 2VCCh. 3 - Prob. 3VC
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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
- Checkout 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_forwardWhat is it important to prove that a process is proven capable before developing statistical control limit ?arrow_forwardx 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_forward
- McDaniel Shipyards wants to develop control charts to assess the quality of its steel plate. They take ten sheets of 1" steel plate and compute the number of cosmetic flaws on each roll. Each sheet is 20' by 100'. Based on the following data, develop limits for the control chart, plot the control chart, and determine whether the process is in control. Sheet Number of flaws 1 1 2 1 3 2 4 0 5 1 6 5 7 0 8 2 9 0 10 2arrow_forwardA process considered to be in control measures an ingredient in ounces. Roberto Baggio, a quality inspector took 20 samples, each with 8 observations as follows: thats in the pictuer after that using this information, obtain three-sigma (i.e., z=3) control limits for a mean control chart and control limits for a range chart, respectively. It is known from previous experience that the standard deviation of the process is 0.693. First: perform all actions and calculations needed to answer the question. All equations/calculations needed to be fully written STEP by STEP. No short calculations or direct answers/results will be accepted. This applies to the calculations for both types of control limits (mean and range). Second: Explain the process followed to identify each type of control limit and any observations made in the problem-solving process. thank you very mucharrow_forwardExplain how to contruct process control chart and use them to determine whether a process is out of statistical control.arrow_forward
- Twelve samples, each containing five parts, were takenfrom a process that produces steel rods at Emmanuel Kodzi’sfactory. The length of each rod in the samples was determined.The results were tabulated and sample means and ranges werecomputed. The results were: a) Determine the upper and lower control limits and the overallmeans for x -charts and R -charts.b) Draw the charts and plot the values of the sample means andranges.c) Do the data indicate a process that is in control?d) Why or why not?arrow_forwardP-chart and c-chart. Using the appropriate control chart, determine two-sigma controllimits for each Problem case, a. An inspector found an average of 3.9 scratches in the exterior paint of each of theautomobiles being prepared for shipment to dealers. b. Before shipping lawnmowers to dealers, an inspector attempts to start each mowerand notes any that do not start on the first try. The lot size is 100 mowers, and anaverage of 4 did not start (4 percent).arrow_forwardCan you please explain the steps to create the control chart ?arrow_forward
- Explain how to construct process control chart and use them to determine whether a process is out of statistical control?arrow_forwardThe time in minutes to replace vehicle wiper blades at a service center was monitored using a mean and a range chart. Six samples of n=20 observations were obtained nd the sample means and ranges were compared. 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 in your text for 20 observations, determine the upper and lower limits for mean and range charts. Is the process within control limits?arrow_forwardA process that is considered to be in control measures an ingredient in ounces. Below are the last 10 samples (each of size 11 = 5) taken. The population process standard deviation, a) What is u;:?b) If::: = 3, what are the control limits for the mean chart?c) What are the control limits for the range chart?d) Is the process in control?arrow_forward
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