Statistical Quality Control
Briefly explain the importance of sample size and sampling frequency in designig a control chart.
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XYZ corporation uses statistical quality control to monitor the quality of their product. They have determined...
XYZ corporation uses statistical quality control to monitor the quality of their product. They have determined the process average, representing the population proportion defective, is 0.02, and size of the samples is 100 units. (3 pts each) a). In constructing a p-chart using 3-sigma limits, what is the UCL? b). In constructing a p-chart using 3-sigma limits, what is the LCL? c). Discuss what would happen if one of the sample values is 0.085.
Problem no.3 The thickness of a metal part is the quality characteristic that statistical process control...
Problem no.3 The thickness of a metal part is the quality characteristic that statistical process control is being applied to. Measurements are taken from 25 subgroups of subgroup size 5. The sum of the X-bar values 1.5735. The sum of the R-values .0231. Xbar/R Chart for x 0636 06396 Subgroup 10 15 20 25 001 0011 a.) Calculate the trial control limits and centerlines for the X-bar and R charts above b.) Calculate the revised control limits and centerlines for...
Industrial Engineering: Statistical and Quality Control Explain the importance of residuals in the analysis of designed experiments.
Industrial Engineering: Statistical and Quality Control Explain the importance of residuals in the analysis of designed experiments.
Binomial Distributions Given your statistical knowledge, you have been asked to assist the quality control manager of a...
Binomial Distributions Given your statistical knowledge, you have been asked to assist the quality control manager of a local manufacturer in establishing and seeing that the factory conforms to standards set by management. The facility manufactures a new electronic toy. The factory can produce 1000 toys per day. Management has indicated that initially they will be satisfied if the defect rate is 3% or less. Since you can’t quality-test every toy produced, you suggest that a random sample of 40...
Quality control A process starts out of statistical control but this is not known to the...
Quality control A process starts out of statistical control but this is not known to the user. It will be stopped after T hr. Once a sample average falls outside the control limits, the process is stopped and investigated. It takes ta hours to find the assignable cause and repair the process at a cost of ca. Units produced under the presence of the assignable cause are assumed nonconforming. Cost of a nonconforming unit is cn. The process generates N...
8.8. A process is in statistical control with 199 and R-3.5. The control chart uses a sample size...
8.8. A process is in statistical control with 199 and R-3.5. The control chart uses a sample size of n- 4. Specifications are at 200+8. The quality char- acteristic is normally distributed. (a) Estimate the potential capability of the process. (b) Estimate the actual process capability (c) How much improvement could be made in process performance if the mean could be cen- tered at the nominal value?
8.8. A process is in statistical control with 199 and R-3.5. The control...
29) A large beverage company would like to use statistical process control to monitor a new...
29) A large beverage company would like to use statistical process control to monitor a new bottling machine designed to load liquid into 350-ml bottles. This company knows that the exact amount the machine places in each bottle can naturally vary by a small amount, but does not have any more specific information about the process. The company operated this new machine under careful supervision, confident that the machine was under complete control, for 7 hours. Each hour, a sample...
The quality control manager at a light bulb factory needs to estimate the mean life of...
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 92 hours. A random sample of 64 light bulbs indicated a sample mean life of 360 hours. Complete parts (a) through (d) below. that the lightbulbs have a mean life of 410 hours. c. Must you assume that the population light bulb life is normally distributed? Explain. O A. Yes, the sample size is...
Parts manufactured by an injection-molding process are subjected to a compressive strength test. We wish to...
Parts manufactured by an injection-molding process are subjected
to a compressive strength test. We wish to monitor the compressive
strength of the parts manufactured by this process, using an x̄ and
an s control chart.
Samples of size 9 are to be taken at regular intervals, and their
mean compressive strength (in psi = pounds per square inch) and
standard deviation are plotted on the charts in time order.
The target values for the compressive strengths are a mean of...
The management of the Diners Delight restaurant chain is in the process of establishing quality control...
The management of the Diners Delight restaurant chain is in the process of establishing quality control charts for the time that its service people give to each customer. Management thinks the length of time that each customer is given should remain within certain limits to enhance service quality. For simplicity, the data from three samples are displayed below. In each sample, four service people were randomly selected, and the customer service they provided was observed. The time (in seconds) to...
Problem no.3 The thickness of a metal part is the quality characteristic that statistical process control is being applied to. Measurements are taken from 25 subgroups of subgroup size 5. The sum of the X-bar values 1.5735. The sum of the R-values .0231. Xbar/R Chart for x 0636 06396 Subgroup 10 15 20 25 001 0011 a.) Calculate the trial control limits and centerlines for the X-bar and R charts above b.) Calculate the revised control limits and centerlines for...
8.8. A process is in statistical control with 199 and R-3.5. The control chart uses a sample size of n- 4. Specifications are at 200+8. The quality char- acteristic is normally distributed. (a) Estimate the potential capability of the process. (b) Estimate the actual process capability (c) How much improvement could be made in process performance if the mean could be cen- tered at the nominal value?
8.8. A process is in statistical control with 199 and R-3.5. The control...
29) A large beverage company would like to use statistical process control to monitor a new bottling machine designed to load liquid into 350-ml bottles. This company knows that the exact amount the machine places in each bottle can naturally vary by a small amount, but does not have any more specific information about the process. The company operated this new machine under careful supervision, confident that the machine was under complete control, for 7 hours. Each hour, a sample...
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 92 hours. A random sample of 64 light bulbs indicated a sample mean life of 360 hours. Complete parts (a) through (d) below. that the lightbulbs have a mean life of 410 hours. c. Must you assume that the population light bulb life is normally distributed? Explain. O A. Yes, the sample size is...
Parts manufactured by an injection-molding process are subjected
to a compressive strength test. We wish to monitor the compressive
strength of the parts manufactured by this process, using an x̄ and
an s control chart.
Samples of size 9 are to be taken at regular intervals, and their
mean compressive strength (in psi = pounds per square inch) and
standard deviation are plotted on the charts in time order.
The target values for the compressive strengths are a mean of...
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