n quality assurance, to monitor characteristics that can be measured we can use: A. control chart for variables B. Control charts for attributes C. x-chart D. A&C
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In quality assurance, to monitor characteristics that can be measured we can use:
A. control chart for variables
B. Control charts for attributes
C. x-chart
D. A&C
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- You work for Raider Data Systems where thousands of insurance records are entered by clerks each day for a variety of client firms. You are in charge of setting control limits to include 99.73% of the random variation in the data entry process when it is in control. Samples that you collected from 20 employees are shown below. You carefully examine 100 records entered by each employee and count the number of errors entered by each clerk. You also compute the proportion defective in each sample. Using a p-chart, what are the upper and lower control limits? Sample Errors Made Proportion Defective 1 4 0.04 2 5 0.05 3 6 0.06 4 3 0.03 5 8 0.08When plotting values on a control chart, the first point that falls outside of the lower control limit (LCL) means Part 2 A. the process owner should take samples more frequently. B. a run has been encountered. C. a type I error has occurred. D. the cause should be investigated.7. An ad agency tracks the complaints, by week received, about the billboards in its city: Week No. of Complaints 1 3 2 6 3 4 4 12 5 2 6 9 This exercise contains only parts a, b, and c. Part 2 a) The type of control chart that is best to monitor this process is c minus chart ______ . Part 3 b) Using z = 3, the control chart limits for this process are (assume that the historical complaints rate is unknown): UCLc = ________ complaints per week (round your response to two decimal places). The upper control limit is: ________ The lower control limit is: _________ The central limit is ___________
- At Webster Chemical Company, lumps in the caulking compound could cause difficulties in dispensing a smooth bead from the tube. Even when the process is in control, an average of four lumps per tube of caulk will remain. Testing for the presence of lumps destroys the product, so an analyst takes random samples. The following results are obtained: Tube No. Lumps Tube No. Lumps Tube No. Lumps 1 6 5 6 9 5 2 5 6 4 10 0 3 0 7 1 11 9 4 4 8 6 12 2 Determine the c-chart two-sigma upper and lower control limits for this process. Is the process in statistical control?Which cusum chart can be used to monitor process variability? a. The two-sided cusum with Ci+ and Ci- . b. The scale cusum with vi c. None of those listed d. The one-sided with Ci+ or Ci- . e. the standardized cusum with yiAbout the OC curve for p chart, which statement is INCORRECT? Select one: a. None of those listed b. There is one particular point on the OC curve at which β=1-α c. The y-axis of the OC curve is β d. The maximum β exists when p is equal to the center line of the control chart e. β is computed based on binomial distribution
- Control charts for X-bar and R, using a subgroup size of 5, are to be applied to control thecritical dimension of a certain manufacturing process. Specifications call for a nominal dimension of1,250.000 + 0.050 mm. The process is believed to have a σ of 0.015 mm Determine appropriate control limits for the X-bar and R charts. a) After 12 subgroups have been drawn and X-bar and R plotted on the charts, a computation of X-double bar give 1,250.015. b1) What is the probability that a value of X-bar will fall within the limits if this is the true value of the mean setting? b2) What is the probability that all 12values fall within the control limits? b) Make the necessary calculations to determine if the process can meet specifications by solvingfor Cp, Cpu, CpL, Cpk . Assume a normal distribution of product output. Illustrate how the processwould look like relative to the result of the computations of the process capability analysis.The SPC chart on page 252 illustrates Darden's use of controlcharts to monitor the weight of salmon filets. Given these data,what conclusion do you, as a Darden quality control inspector,draw? What report do you issue to your supervisor? How doyou respond to the salmon vendor?The application of control charts is straightforward in manufacturing processes when you have tangible goods with physical characteristics you can easily measure on a numerical scale. Quality control is also important in service businesses, but you are generally not going to want to measure the physical characteristics of your customers! Do you thinkcontrol charts have a place in service businesses? Discuss how you might apply them to specii c examples.
- A metal fabricator produces connecting rods with an outer diameter that has a 1 ± .01–inch specification. A machine operator takes several sample measurements over time and determines the sample mean outer diameter to be 1.002 inches with a standard deviation of .003 inch.a. Calculate the process capability index for this example.b. What does this figure tell you about the process?Pertaining to the OC curve for any control chart, which of the following is INCORRECT? Select one: a. None of those listed b.OC stands for Operating Characteristics c. The error shown in the OC curve is type 2 error d. For a given sample size, the probability of error is inversely proportional to the amount of deviation (away from the target value) e. An OC curve corresponding to a larger sample size is steeperWhich of the following is NOT a common tool used in quality control a. acceptance sampling b. Pareto chart c. cause and effect diagram d. decision trees