The postmaster of a small western town receives a certain number of complaints each day about mail delivery.
Days | Number of complaints |
1 | 4 |
2 | 10 |
3 | 15 |
4 | 8 |
5 | 9 |
6 | 6 |
7 | 5 |
8 | 13 |
9 | 15 |
10 | 7 |
11 | 6 |
Total | 98 |
For the above data, we can use c-chart because it is without a specific sample size
C-bar = Total Number of defects / Total number of samples
= 98/ 11 = 8.9091
UCL = c-bar + z *√(c-bar)
= 8.9091 + 2 * √ (8.9091)
= 14.879
Lower control limits (LCL) can be calculated by using 2-sigma control limits, where z = 2
LCL = c-bar - z *√(c-bar)
= 8.9091 - 2 * √ (8.9091)
= 2.939
Problem 10-7 The postmaster of a small western town receives a certain number of complaints each...
Problem 10-7 The postmaster of a small western town receives a certain number of complaints each day about mail delivery. 1 4 Number of complaints 2 10 3 15 4 8 5 9 DAY 7 8 5 13 6 6 9 15 10 7 11 6 12 4 13 2 14 11 a.Determine two-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places and final answers to 3 decimal places. Leave no cells blank.be certain...
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The postmaster of a small western town receives a certain number of complaints each day about mail delivery. 2 1 4 Number of complaints 3 14 4 8 5 9 6 6 DAY 8 13 7 5 9 14 10 7 11 6 12 4 13 2 14 11 11 a.Determine two-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places and final answers to 3 decimal places. Leave no cells blank - be certain...
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uiz - Quality Control Saved Submit Help Save & Exit The postmaster of a small western town receives a certain number of complaints each day about mail delivery. DAY 2 4 7 10 11 12 13 14 6 Number of complaints 4 10 10 16 9 6 5 14 13 7 4 2 a.Determine three-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places and final answers to 3 decimal places. Leave no cells blank...
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