Concept explainers
a)
To determine: The upper and lower control limits for the control chart and graph the data.
Introduction: A process is said to be operating in “statistical control” when all the variations in the process that are due to assignable causes have been identified and removed. In other words, the only variations are due to natural causes. In such a state, the process is said to be in “statistical control”
b)
To determine: Whether the process is in control
Introduction: A process is said to be operating in “statistical control” when all the variations in the process that are due to assignable causes have been identified and removed. In other words, the only variations are due to natural causes. In such a state, the process is said to be in “statistical control”
c)
To determine: The control limits, if the
Introduction: A process is said to be operating in “statistical control” when all the variations in the process that are due to assignable causes have been identified and removed. In other words, the only variations are due to natural causes. In such a state, the process is said to be in “statistical control”
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OPERATIONS MANAGEMENT: SUSTAIN ACCESS C
- What is it important to prove that a process is proven capable before developing statistical control limit ?arrow_forwardJamison Kovach Supply Company manufactures paper clips and other office products. Although inexpensive, paper clips have provided the firm with a high margin of profitability. Sample size is 50. Results are given for the last 10 samples. Sample 1 2 3 4 5 6 7 8 9 10 Defectives 5 7 2 5 6 5 5 4 1 11 Part 2 The type of control chart that is best to monitor this process is p minus chartp−chart . Part 3 a) Establish the control limits to include 99.73% of the random variation in defectives. UCLp = enter your response here (enter your response as a number between 0 and 1, rounded to three decimal places).arrow_forwardExplain how to contruct process control chart and use them to determine whether a process is out of statistical control.arrow_forward
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- 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.arrow_forward30 The upper and lower limits for diving ring diameters made by John's Swimming Co. are 40 and 39 cm., respectively. John took 11 samples with the following average diameters (39, 39.1, 39.2, 39.3, 39.4, 39.5 39.6, 39.7, 39.8, 39.9, 40). Is the process in control? Select one: a. no, there is a distinguishable pattern in the samples. b. Yes, no diameters exceeded the control limits. c. no, the range is not in control. d. no, some diameters exceeded the control limits. e. There is not enough information to make a decision.arrow_forwardThe results of an inspection of DNA samples takenover the past 10 days are given below. Sample size is 100. a) Construct a 3-sigma p -chart using this information. b) Using the control chart in part (a), and finding that the num-ber of defectives on the next three days are 12, 5, and 13, is the process in control?arrow_forward
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