Assignment:
The department of transportation records the number of car accidents occurred on a highway over the past 12 months.
| Month |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
| Sample C |
9 |
6 |
5 |
11 |
14 |
7 |
6 |
4 |
5 |
7 |
2 |
10
|
a) For this case, identify the item to be controlled. What type of control chart should be used? why?
b) Plot the control chart based on three-sigma limits. Is the process in control? What conclusion can you draw based on the control chart?
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