A company that makes car parts. The company control its production process by periodically taking a...
A company that makes car parts. The company control its production process by periodically taking a sample of 100 units from the production line. Each product is inspected for defective features. Control limits are developed using three standard deviations from the mean as the limit. During the last 12 samples taken, the proportion of defective items per sample was recorded as follows:
|
0.01 |
0.01 |
0.0 |
0.04 |
0.01 |
0.01 |
|
0.00 |
0.01 |
0.02 |
0.02 |
0.03 |
0.03 |
a. Determine the mean proportion defective, the UCL, and the LCL? (Marks 1) (word count maximum:150)
b. Draw a control chart and plot each of the sample measurements on it? (Marks 1) (word count maximum:100)
c. Does it appear that the process for making tees is in statistical control? (Marks 0.5) (word count maximum:100)
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A company that makes car parts. The company control its
production process by periodically taking a...
a production process is considered in control if up to 4% of items produced are defective. samples of size 100 are used for the inspection process. determine the upper and lower control limits for the...
a production process is considered in control if up to 4% of items produced are defective. samples of size 100 are used for the inspection process. determine the upper and lower control limits for the p chart. A. UCL= .0988 LCL=0.0000 B. UCL=.0888 LCL= 0.000 C. UCL= .0788 LCL= .01 D. UCL= 0.0688 LCL= .02
Consider the p chart below. Note that LCL 0, CLp0.01667, and UCL 0.04802 Does the process...
Consider the p chart below. Note that LCL 0, CLp0.01667, and UCL 0.04802 Does the process appear to be in a state of statistical control? a. P Chartof Nonconforming Units 0.05 UaL-0.04802 b. What sample size is needed in order to have a positive lower 0.04 control limit? E 0.03 0.02 ?-0.0 1667 0.01 0.00 1 3 5 79111315 17 19
Twenty samples of 100 items each were inspected when a process was considered to be operating...
Twenty samples of 100 items each were inspected when a process was considered to be operating satisfactorily. In the 20 samples, a total of 135 items were found to be defective. (a) What is an estimate of the proportion defective when the process is in control? (b) What is the standard error of the proportion if samples of size 100 will be used for statistical process control? (Round your answer to four decimal places.) (c)Compute the upper and lower control...
Twenty samples of 100 items each were inspected when a process was considered to be operating...
Twenty samples of 100 items each were inspected when a process was considered to be operating satisfactorily. In the 20 samples, a total of 130 items were found to be defective. (a) What is an estimate of the proportion defective when the process is in control? (Round your answer to four decimal places.) (b) What is the standard error of the proportion if samples of size 100 will be used for statistical process control? (Round your answer to four decimal...
A manufacturer of dustless chalk instituted a quality control program to monitor chalk density. The sample standard dev...
A manufacturer of dustless chalk instituted a quality control program to monitor chalk density. The sample standard deviations of densities for 24 different subgroups, each consisting of n 8 chalk specimens, were as follows: This data has been coded so that you may copy and paste it into R with the name k.sdevs. k.sdevs c(0.202, 0.315, 0.097, 0.182, 0.229, 0.215, 0.320, 0.288, 0.146, 0.208, 0.050, 0.145, 0.269, 0.350, 0.158. 0.215, 0.386, 0.187, 0.151, 0.231, 0.275, 0.117, 0.091, 0.059) mean(k.sdevs) #Construct...
Temperature is used to measure the output of a production process. When the process is in...
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f dustless chalk Instituted a quality control program A manufacturer o monitor chalk density. The sample standard devia...
f dustless chalk Instituted a quality control program A manufacturer o monitor chalk density. The sample standard deviations of densities for 24 different subgroups, each consisting of n 8 chalk specimens, were as follows: This data has been coded so that you may copy and paste it into R with the name k.sdevs. k.sdevs c(0.207, 0.313, 0.097, 0.186, 0.233, 0.209, 0.319, 0.290, 0.143 0.212, 0.054, 0.146, 0.274, 0.348, 0.161, 0.216, 0.090, 0.056) 0.152, 0.231, 0.274, 0.121, 0.385, 0.188. mean(k.sdevs) #...
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.
Control A speaker manufacturer molds kevlar woofer surro surrounds are randomly sampled each five minutes, measured, and the average and range for each unds for use in 6.5 woofers. Samples of 7 w...
Control A speaker manufacturer molds kevlar woofer surro surrounds are randomly sampled each five minutes, measured, and the average and range for each unds for use in 6.5 woofers. Samples of 7 woofer sample is computed. The following data represent the summary statistics for the most recent 14 Sample Mean 6.49* 6.47 6.49 6.51 6.50 6.46 6.47 6.52 6.51 6.48 6.49 6.50 6.52 6.46 Range 0.05. 0.03 0.07 0.02 0.06 0.08 0.03 0.04 0.07 0.03 0.05 0.03* 0.04 2 6...
Temperature is used to measure the output of a production process. When the process is in...
Temperature is used to measure the output of a production process. When the process is in control, the mean of the process is p - 124.5 and the standard deviation is o -0.3. (a) Compute the upper and lower control limits if samples of size 6 are to be used. (Round your answers to two decimal places.) UCL - LCL = UCI UCL Construct the chart for this process 125.50+ 125.25 125.00 124.75 124.50 124.25 124.00 123.75 UCL Sample Mean...
Consider the p chart below. Note that LCL 0, CLp0.01667, and UCL 0.04802 Does the process appear to be in a state of statistical control? a. P Chartof Nonconforming Units 0.05 UaL-0.04802 b. What sample size is needed in order to have a positive lower 0.04 control limit? E 0.03 0.02 ?-0.0 1667 0.01 0.00 1 3 5 79111315 17 19
A manufacturer of dustless chalk instituted a quality control program to monitor chalk density. The sample standard deviations of densities for 24 different subgroups, each consisting of n 8 chalk specimens, were as follows: This data has been coded so that you may copy and paste it into R with the name k.sdevs. k.sdevs c(0.202, 0.315, 0.097, 0.182, 0.229, 0.215, 0.320, 0.288, 0.146, 0.208, 0.050, 0.145, 0.269, 0.350, 0.158. 0.215, 0.386, 0.187, 0.151, 0.231, 0.275, 0.117, 0.091, 0.059) mean(k.sdevs) #Construct...
Temperature is used to measure the output of a production process. When the process is in control, the mean of the process is L= 122.5 and the standard deviation is o 0.4 (a) Compute the upper and lower control limits if samples of size 6 are to be used. (Round your answers to two decimal places.) UCL LCL Construct the x chart for this process. 123.50t 123.50t UCL 123.25- 123.25 UCL 123.00 123.00 122.75 122.75 122.50 122.50 122.25t 122.25 122.00...
f dustless chalk Instituted a quality control program A manufacturer o monitor chalk density. The sample standard deviations of densities for 24 different subgroups, each consisting of n 8 chalk specimens, were as follows: This data has been coded so that you may copy and paste it into R with the name k.sdevs. k.sdevs c(0.207, 0.313, 0.097, 0.186, 0.233, 0.209, 0.319, 0.290, 0.143 0.212, 0.054, 0.146, 0.274, 0.348, 0.161, 0.216, 0.090, 0.056) 0.152, 0.231, 0.274, 0.121, 0.385, 0.188. mean(k.sdevs) #...
Control A speaker manufacturer molds kevlar woofer surro surrounds are randomly sampled each five minutes, measured, and the average and range for each unds for use in 6.5 woofers. Samples of 7 woofer sample is computed. The following data represent the summary statistics for the most recent 14 Sample Mean 6.49* 6.47 6.49 6.51 6.50 6.46 6.47 6.52 6.51 6.48 6.49 6.50 6.52 6.46 Range 0.05. 0.03 0.07 0.02 0.06 0.08 0.03 0.04 0.07 0.03 0.05 0.03* 0.04 2 6...
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