A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance...
A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance requests that require a second call to complete the repair. Eight weeks of data is shown in the table below.
What are the revised control limits?
|
Sample Number |
Sample Size |
Number Nonconforming |
|
1 |
100 |
10 |
|
2 |
100 |
15 |
|
3 |
100 |
31 |
|
4 |
100 |
18 |
|
5 |
100 |
24 |
|
6 |
100 |
12 |
|
7 |
100 |
23 |
|
8 |
100 |
15 |
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A maintenance group improves the effectiveness of its repair
work by monitoring the number of maintenance...
A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance...
A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance requests that require a second call to complete the repair. Eight weeks of data is shown in the table below. Construct the trial control chart for this process using Minitab from part (a). Is the process in-control (yes or no)? Why? What should be done? Sample Number Sample Size Number Nonconforming 1 100 10 2 100 15 3 100 31 4 100 18 5...
2- The number of nonconforming switches in Number of Number of samples of size 150 are...
2- The number of nonconforming switches in Number of Number of samples of size 150 are shown in the Table. Sample Construct a fraction nonconforming control chart (p-chart) for these data. Does the process appear to be in control? If not assume that assignable causes can be found 4 for all points outside the control limits and calculate the revised control limits. Nonconforming Switches Sample Number Nonconforniro Switches Number 12 13 14 15 16 17 18 19 0 15 10
Part 3 [35 Marks 3- The number of nonconforming switches in samples of size 75 are...
Part 3 [35 Marks 3- The number of nonconforming switches in samples of size 75 are shown in Table 3. [20 Marks] Table 3 Number of Nonconforming Assemblies Number of Sample Nonconforming Number Sample Number Assemblies 6 7 11 1 15 12 2 0 13 1 3 9 14 3 4 5 15 6 5 1 16 8 4 17 10 7 5 18 5 7 19 2 9 12 20 7 10 (a) Construct a fraction nonconforming control chart...
A large certified public accounting firm has been monitoring the accuracy of its employees and wishes...
A large certified public accounting firm has been monitoring the accuracy of its employees and wishes to get the number of accounts with errors under statistical control. It has sampled 100 accounts for each of the last 30 days and has examined them for errors, with the results shown in the accompanying data. Complete parts a through c below. Click the icon to view the counts for accounts with errors. a. Construct a p-chart for the account process. Choose the...
The Money Pit Mortgage Company is interested in monitoring the performance of the mortgage process. Fifteen...
The
Money Pit Mortgage Company is interested in monitoring the
performance of the mortgage process. Fifteen samples of five
completed mortgage transactions each were taken during a period
when the process was believed to be in control. The times to
complete the transactions were measured. The means and ranges of
the mortgage process transaction times, measured in days, are as
follows:
b.
Sample123456789 10 11 12 13 14 15 Mean 5 103 7 8 13 14 9 9 9 5...
The Money Pit Mortoage Company is interested in monitoring the performance of the mortoage procees. Firieen...
The Money Pit Mortoage Company is interested in monitoring the performance of the mortoage procees. Firieen samples of five compieted mortgage traneactions each were teken duing a period when the procees was beieved to be in control The times to complete the transsctons were meesured. The meens and ranges of the mongege process trensschon imes, measured in days, are as folows: Sample 1 2 3 4 9 10 11 12 13 14 15 Mean 13 11 5 14 12 13...
An office equipment corporation performs preventive maintenance and repair on the line of copiers that it sells. For 45...
An office equipment corporation performs preventive maintenance and repair on the line of copiers that it sells. For 45 recent service calls data has been collected on the number of copiers serviced during the call and the number of minutes spent on the call by the service person. The company would like to develop a regression model that can be used to predict the amount of time (in minutes) that a call will require based on the number of copiers...
The data shown in the table below are i and R values for 24 samples of...
The data shown in the table below are i and R values for 24 samples of size n-5 taken from a process producing bearings. The measurements are made on the inside diameter of the bearing. with only the last three decimals recorded (fi.e., 34.5 should be 0.50345). Sample i Number Sample R Number 13 14 15 16 17 18 19 20 21 35.4 34.0 37.1 34.9 33.5 31.7 34.0 35.1 33.7 32.8 33.5 345 34.2 31.6 315 35.0 34.1 32.6...
Older people often have a hard time finding work. A research group reported on the number...
Older people often have a hard time finding work. A research group reported on the number of weeks it takes a worker aged 55 plus to find a job. The data on number of weeks spent searching for a job is given in the table below. 25 1855 20 2118 20 1652 4 31 21 36 28 16 1456 25 30 18 17 28 23 32 3030 14 25 48 40 26 43 21 21 1423 20 269 26 (a)...
The Money Pit Mortgage Company is interested in monitoring the performance of the mortgage process. Fifteen...
The Money Pit Mortgage Company is interested in monitoring the performance of the mortgage process. Fifteen samples of five completed mortgage transactions each were taken during a period when the process was believed to be in control. The times to complete the transactions were measured. The Money Pit Mortgage Company made some changes to the process and undertook a process capability study. The following data were obtained for 15 samples of size 5. Based on the individual observations, management estimated...
2- The number of nonconforming switches in Number of Number of samples of size 150 are shown in the Table. Sample Construct a fraction nonconforming control chart (p-chart) for these data. Does the process appear to be in control? If not assume that assignable causes can be found 4 for all points outside the control limits and calculate the revised control limits. Nonconforming Switches Sample Number Nonconforniro Switches Number 12 13 14 15 16 17 18 19 0 15 10
Part 3 [35 Marks 3- The number of nonconforming switches in samples of size 75 are shown in Table 3. [20 Marks] Table 3 Number of Nonconforming Assemblies Number of Sample Nonconforming Number Sample Number Assemblies 6 7 11 1 15 12 2 0 13 1 3 9 14 3 4 5 15 6 5 1 16 8 4 17 10 7 5 18 5 7 19 2 9 12 20 7 10 (a) Construct a fraction nonconforming control chart...
A large certified public accounting firm has been monitoring the accuracy of its employees and wishes to get the number of accounts with errors under statistical control. It has sampled 100 accounts for each of the last 30 days and has examined them for errors, with the results shown in the accompanying data. Complete parts a through c below. Click the icon to view the counts for accounts with errors. a. Construct a p-chart for the account process. Choose the...
The
Money Pit Mortgage Company is interested in monitoring the
performance of the mortgage process. Fifteen samples of five
completed mortgage transactions each were taken during a period
when the process was believed to be in control. The times to
complete the transactions were measured. The means and ranges of
the mortgage process transaction times, measured in days, are as
follows:
b.
Sample123456789 10 11 12 13 14 15 Mean 5 103 7 8 13 14 9 9 9 5...
The Money Pit Mortoage Company is interested in monitoring the performance of the mortoage procees. Firieen samples of five compieted mortgage traneactions each were teken duing a period when the procees was beieved to be in control The times to complete the transsctons were meesured. The meens and ranges of the mongege process trensschon imes, measured in days, are as folows: Sample 1 2 3 4 9 10 11 12 13 14 15 Mean 13 11 5 14 12 13...
The data shown in the table below are i and R values for 24 samples of size n-5 taken from a process producing bearings. The measurements are made on the inside diameter of the bearing. with only the last three decimals recorded (fi.e., 34.5 should be 0.50345). Sample i Number Sample R Number 13 14 15 16 17 18 19 20 21 35.4 34.0 37.1 34.9 33.5 31.7 34.0 35.1 33.7 32.8 33.5 345 34.2 31.6 315 35.0 34.1 32.6...
Older people often have a hard time finding work. A research group reported on the number of weeks it takes a worker aged 55 plus to find a job. The data on number of weeks spent searching for a job is given in the table below. 25 1855 20 2118 20 1652 4 31 21 36 28 16 1456 25 30 18 17 28 23 32 3030 14 25 48 40 26 43 21 21 1423 20 269 26 (a)...
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