Homework SourseA delivery company checked delivery time for 40 randomlysele
A delivery company checked delivery time for 40 randomly-selected packages for 8 consecutive days. The chart below shows the number of packages that were delivered late on each of those days. Develop a p-chart and answer questions 1, 2 and 3 from this data.
Day
late packages
1
2
2
0
3
1
4
5
5
2
6
1
7
0
8
0
What is the UCL on the p-chart?
What is the LCL on the p-chart?
What can you determine about the process?
| Day | late packages |
| 1 | 2 |
| 2 | 0 |
| 3 | 1 |
| 4 | 5 |
| 5 | 2 |
| 6 | 1 |
| 7 | 0 |
| 8 | 0 |
Solution
excel is used for the analysis.
from the data we see that some of the values fall outside the control limits, hence is process is not under control.
| Sample size | 40 | ||
| Number of samples | 8 | ||
| Proportion defective | |||
| Upper Control Limit, UCL | 0.1208 | ||
| Center | 0.0344 | ||
| Lower Control Limit, LCL | 0.0000 |
